SettingsLast update:
| Time UTC | DSCOVR | ACE | ||||
|---|---|---|---|---|---|---|
| Solar Wind | GSM | Solar Wind | GSM | |||
| Proton Density | Bulk Speed | Bz | Proton Density | Bulk Speed | Bz | |
| 20:10 | - | - | - | - | - | - |
| 20:09 | - | - | - | - | - | - |
| 20:08 | - | - | - | - | - | - |
| 20:07 | - | - | -2.97 | - | - | -3.0 |
| 20:06 | 2.62 | 487.9 | -2.59 | 2.6 | 487.9 | -2.6 |
| 20:05 | 2.14 | 490.0 | -4.11 | 2.1 | 490.0 | -4.1 |
| 20:04 | 3.17 | 527.0 | -3.25 | 3.2 | 527.0 | -3.2 |
| 20:03 | 3.54 | 538.9 | -3.25 | 3.5 | 538.9 | -3.2 |
| 20:02 | 1.96 | 492.0 | - | 2.0 | 492.0 | - |
| 20:01 | 1.87 | 504.1 | -3.29 | 1.9 | 504.1 | -3.3 |
| 20:00 | 0.99 | 470.3 | -1.41 | 1.0 | 470.3 | -1.4 |
| 19:59 | 0.69 | 451.5 | -0.09 | 0.7 | 451.5 | -0.1 |
| 19:58 | 1.71 | 497.3 | 1.13 | 1.7 | 497.3 | 1.1 |
| 19:57 | 1.51 | 509.7 | 1.08 | 2.1 | 511.9 | 1.1 |
| 19:56 | 1.99 | 515.2 | -1.08 | 2.0 | 515.2 | -1.1 |
| 19:55 | 1.55 | 506.2 | 0.46 | 1.5 | 506.2 | 0.5 |
| 19:54 | 1.92 | 504.7 | 2.93 | 1.9 | 504.7 | 2.9 |
| 19:53 | 1.66 | 536.8 | 2.25 | 1.7 | 536.8 | 2.2 |
| 19:52 | 1.86 | 540.4 | 1.06 | 1.9 | 540.4 | 1.1 |
| 19:51 | 2.06 | 489.1 | -0.08 | 2.1 | 489.1 | -0.1 |
| 19:50 | 2.28 | 504.1 | -0.47 | 2.3 | 504.1 | -0.5 |
| 19:49 | 0.57 | 438.8 | -1.65 | 0.6 | 438.8 | -1.6 |
| 19:48 | 1.92 | 486.4 | -2.52 | 1.9 | 486.4 | -2.5 |
| 19:47 | 2.41 | 502.2 | -3.45 | 2.4 | 502.2 | -3.5 |
| 19:46 | 2.48 | 512.0 | -4.21 | 2.5 | 512.0 | -4.2 |
| 19:45 | 1.20 | 461.3 | -4.10 | 1.2 | 461.3 | -4.1 |
| 19:44 | 1.18 | 444.9 | -4.63 | 1.2 | 444.9 | -4.6 |
| 19:43 | 2.36 | 491.4 | -4.60 | 2.4 | 491.4 | -4.6 |
| 19:42 | 1.64 | 481.7 | -4.78 | 1.6 | 481.7 | -4.8 |
| 19:41 | 0.74 | 455.5 | -3.88 | 0.7 | 455.5 | -3.9 |
| 19:40 | 1.88 | 519.5 | -0.68 | 1.9 | 519.5 | -0.7 |
| 19:39 | 1.64 | 520.6 | -0.63 | 1.6 | 520.6 | -0.6 |
| 19:38 | 1.49 | 532.9 | 0.71 | 1.5 | 532.9 | 0.7 |
| 19:37 | 0.06 | 408.9 | 0.62 | 0.1 | 408.9 | 0.6 |
| 19:36 | 1.70 | 500.3 | 0.38 | 1.7 | 500.3 | 0.4 |
| 19:35 | 2.03 | 534.0 | 1.13 | 2.0 | 534.0 | 1.1 |
| 19:34 | 2.91 | 495.1 | 1.58 | 2.9 | 495.1 | 1.6 |
| 19:33 | 1.89 | 503.0 | 0.27 | 1.9 | 503.0 | 0.3 |
| 19:32 | 1.78 | 485.1 | -2.83 | 1.8 | 485.1 | -2.8 |
| 19:31 | 0.73 | 444.5 | -2.28 | 0.7 | 444.5 | -2.3 |
| 19:30 | 0.21 | 428.8 | -2.73 | 0.2 | 428.8 | -2.7 |
| 19:29 | 2.37 | 492.2 | -2.05 | 2.4 | 492.2 | -2.1 |
| 19:28 | 2.24 | 496.1 | -2.32 | 2.2 | 496.1 | -2.3 |
| 19:27 | 2.02 | 512.0 | -1.70 | 2.0 | 512.0 | -1.7 |
| 19:26 | 2.02 | 526.1 | -4.01 | 2.0 | 526.1 | -4.0 |
| 19:25 | 2.09 | 511.1 | -5.07 | 2.1 | 511.1 | -5.1 |
| 19:24 | 1.70 | 487.2 | -5.93 | 1.7 | 487.2 | -5.9 |
| 19:23 | 1.51 | 490.1 | -3.21 | 1.5 | 490.1 | -3.2 |
| 19:22 | 0.29 | 417.8 | -2.20 | 0.3 | 417.8 | -2.2 |
| 19:21 | 1.93 | 474.6 | -1.38 | 1.9 | 474.6 | -1.4 |
| 19:20 | 2.01 | 512.9 | -1.70 | 2.0 | 512.9 | -1.7 |
| 19:19 | 1.63 | 523.5 | -1.89 | 1.6 | 523.5 | -1.9 |
| 19:18 | 1.64 | 512.8 | -1.96 | 1.6 | 512.8 | -2.0 |
| 19:17 | 1.41 | 491.7 | -1.79 | 1.4 | 491.7 | -1.8 |
| 19:16 | 2.01 | 497.1 | -1.99 | 2.0 | 497.1 | -2.0 |
| 19:15 | 0.82 | 445.1 | -3.38 | 0.8 | 445.1 | -3.4 |
| 19:14 | 0.80 | 518.6 | -4.96 | 0.8 | 518.6 | -5.0 |
| 19:13 | 1.33 | 566.9 | -1.04 | 1.3 | 566.9 | -1.0 |
| 19:12 | 0.78 | 513.0 | 1.94 | 0.8 | 513.0 | 1.9 |
| 19:11 | 0.11 | 464.8 | 3.11 | 0.1 | 464.8 | 3.1 |
| 19:10 | 0.14 | 459.9 | 6.09 | 0.1 | 459.9 | 6.1 |
| 19:09 | 0.09 | 457.0 | 6.12 | 0.1 | 457.0 | 6.1 |
| 19:08 | 0.11 | 459.1 | 7.49 | 0.1 | 459.1 | 7.5 |
| 19:07 | 0.13 | 461.7 | 7.47 | 0.1 | 461.7 | 7.5 |
| 19:06 | 0.01 | 455.5 | 7.87 | 0.0 | 455.5 | 7.9 |
| 19:05 | 0.03 | 426.1 | 8.36 | 0.0 | 426.1 | 8.4 |
| 19:04 | 0.02 | 480.6 | 8.08 | 0.0 | 480.6 | 8.1 |
| 19:03 | 0.14 | 461.1 | 8.43 | 0.1 | 461.1 | 8.4 |
| 19:02 | 0.10 | 455.4 | 8.08 | 0.1 | 455.4 | 8.1 |
| 19:01 | 0.10 | 454.8 | 7.75 | 0.1 | 465.8 | 7.7 |
| 19:00 | 0.04 | 465.5 | 7.61 | 0.0 | 465.5 | 7.6 |
| 18:59 | 0.16 | 468.6 | 7.67 | 0.2 | 468.6 | 7.7 |
| 18:58 | 0.13 | 453.4 | 8.73 | 0.1 | 453.4 | 8.7 |
| 18:57 | 0.08 | 442.9 | 8.54 | 0.1 | 442.9 | 8.5 |
| 18:56 | 0.03 | 478.3 | 8.28 | 0.0 | 478.3 | 8.3 |
| 18:55 | 0.07 | 469.5 | 8.68 | 0.1 | 469.5 | 8.7 |
| 18:54 | 0.14 | 455.6 | 8.51 | 0.1 | 455.6 | 8.5 |
| 18:53 | 0.14 | 453.1 | 8.47 | 0.1 | 453.1 | 8.5 |
| 18:52 | 0.15 | 455.9 | 8.66 | 0.1 | 455.9 | 8.7 |
| 18:51 | 0.15 | 455.5 | 8.70 | 0.2 | 455.5 | 8.7 |
| 18:50 | 0.06 | 434.1 | 8.80 | 0.1 | 434.1 | 8.8 |
| 18:49 | 0.13 | 459.2 | 9.00 | 0.1 | 459.2 | 9.0 |
| 18:48 | 0.12 | 460.0 | 8.87 | 0.1 | 460.0 | 8.9 |
| 18:47 | 0.15 | 467.8 | 8.79 | 0.2 | 467.8 | 8.8 |
| 18:46 | 0.10 | 452.6 | 9.70 | 0.1 | 452.6 | 9.7 |
| 18:45 | 0.03 | 450.2 | 9.66 | 0.0 | 450.2 | 9.7 |
| 18:44 | 0.03 | 457.1 | 9.58 | 0.0 | 457.1 | 9.6 |
| 18:43 | 0.05 | 439.2 | 8.89 | 0.0 | 439.2 | 8.9 |
| 18:42 | 0.03 | 444.0 | 9.80 | 0.0 | 444.0 | 9.8 |
| 18:41 | 0.02 | 448.3 | 8.05 | 0.0 | 448.3 | 8.0 |
| 18:40 | 0.06 | 454.6 | 7.74 | 0.1 | 454.6 | 7.7 |
| 18:39 | 0.11 | 463.2 | 7.84 | 0.1 | 463.2 | 7.8 |
| 18:38 | 0.13 | 463.2 | 7.73 | 0.1 | 463.2 | 7.7 |
| 18:37 | 0.17 | 467.9 | 7.57 | 0.2 | 467.9 | 7.6 |
| 18:36 | 0.13 | 464.1 | 7.38 | 0.1 | 464.1 | 7.4 |
| 18:35 | 0.05 | 454.5 | 7.58 | 0.0 | 454.5 | 7.6 |
| 18:34 | 0.08 | 464.2 | 7.56 | 0.1 | 464.2 | 7.6 |
| 18:33 | 0.11 | 464.6 | 7.42 | 0.1 | 464.6 | 7.4 |
| 18:32 | 0.09 | 465.0 | - | 0.1 | 466.3 | - |
| 18:31 | 0.13 | 467.0 | 7.01 | 0.1 | 467.0 | 7.0 |
| 18:30 | 0.14 | 474.4 | 6.88 | 0.1 | 474.4 | 6.9 |
| 18:29 | 0.17 | 477.0 | 6.29 | 0.2 | 477.0 | 6.3 |
| 18:28 | 0.12 | 464.7 | 5.88 | 0.1 | 464.7 | 5.9 |
| 18:27 | 0.16 | 467.5 | 6.30 | 0.2 | 467.5 | 6.3 |
| 18:26 | 0.20 | 458.5 | 6.95 | 0.2 | 458.5 | 7.0 |
| 18:25 | - | - | 7.27 | - | - | 7.3 |
| 18:24 | - | - | 6.30 | - | - | 6.3 |
| 18:23 | 0.61 | 464.3 | 5.86 | 0.6 | 464.3 | 5.9 |
| 18:22 | 0.50 | 470.2 | 6.32 | 0.5 | 470.2 | 6.3 |
| 18:21 | 0.29 | 479.8 | 5.87 | 0.3 | 479.8 | 5.9 |
| 18:20 | 0.30 | 477.1 | 5.75 | 0.3 | 477.1 | 5.7 |
| 18:19 | 0.29 | 477.1 | 5.95 | 0.3 | 477.1 | 6.0 |
| 18:18 | 0.19 | 468.1 | 6.19 | 0.2 | 468.1 | 6.2 |
| 18:17 | 0.15 | 464.2 | 5.64 | 0.2 | 464.2 | 5.6 |
| 18:16 | 0.15 | 459.4 | 3.73 | 0.2 | 459.4 | 3.7 |
| 18:15 | 0.15 | 472.4 | 3.48 | 0.2 | 472.4 | 3.5 |
| 18:14 | 0.15 | 478.1 | 3.69 | 0.1 | 478.1 | 3.7 |
| 18:13 | 0.12 | 454.9 | 3.93 | 0.1 | 454.9 | 3.9 |
| 18:12 | 0.15 | 465.4 | 4.64 | 0.1 | 465.4 | 4.6 |
| 18:11 | 0.14 | 478.0 | 5.11 | 0.1 | 478.0 | 5.1 |
Built 2026-03-21 20:11 from source
| Solar wind parameters of the latest hour by NOAA | |||
|---|---|---|---|
| parameter | min | max | mean |
| IMF Bz [nT] | -5.9 | 8.4 | 0.2 |
| velocity [km/s] | 408.9 | 566.9 | 487.2 |
| density [cm-3] | 0.0 | 2.9 | 1.3 |
| Geomagnetic activity (RX [nT]) | ||
|---|---|---|
| site | latest hour | next hour (RXmin, RXmax) |
| Kevo (KEV) | 88 | 12 | 321 |
| Maasi (MAS) | 87 | 11 | 318 |
| Kilpisjärvi (KIL) | 105 | 10 | 321 |
| Ivalo (IVA) | 70 | 7 | 264 |
| Muonio (MUO) | 56 | 7 | 242 |
| Sodankylä (SOD) | 34 | 6 | 221 |
| Pello (PEL) | 39 | 6 | 217 |
| Oulujärvi (OUJ) | 24 | 5 | 87 |
| Mekrijärvi (MEK) | 13 | 3 | 35 |
| Hankasalmi (HAN) | 14 | 4 | 44 |
| Nurmijärvi (NUR) | - | 4 | 41 |
| Tartu (TAR) | 11 | 3 | 30 |
| low | increased | moderate | high | very high |
Short explanation of the method
AurorasNow! (Finnish Meteorological Institute)Built 2026-03-21 20:02 from source
Issue Time: 2026-03-21 19:46 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day
Mar 22: G2 (Moderate) Mar 23: G1 (Minor) Mar 24: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G2 (Moderate) geomagnetic storming is likely on 22 Mar due to waning CME influences followed by the anticipated arrival of CH HSS effects. Isolated periods of G1 (Minor) geomagnetic storming is likely to continue into 23 Mar as CH HSS effects continue.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day
Mar 22: G2 (Moderate) Mar 23: G1 (Minor) Mar 24: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G2 (Moderate) geomagnetic storming is likely on 22 Mar due to waning CME influences followed by the anticipated arrival of CH HSS effects. Isolated periods of G1 (Minor) geomagnetic storming is likely to continue into 23 Mar as CH HSS effects continue.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
Issue Time: 2026-03-21 16:50 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2209
Valid From: 2026-03-20 19:30 UTC
Now Valid Until: 2026-03-22 06:00 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2209
Valid From: 2026-03-20 19:30 UTC
Now Valid Until: 2026-03-22 06:00 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Issue Time: 2026-03-21 16:47 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5291
Valid From: 2026-03-20 07:19 UTC
Now Valid Until: 2026-03-22 12:00 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5291
Valid From: 2026-03-20 07:19 UTC
Now Valid Until: 2026-03-22 12:00 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Issue Time: 2026-03-21 07:53 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026-03-21 07:52 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026-03-21 07:52 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Issue Time: 2026-03-21 05:17 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 645
Valid From: 2026-03-20 20:20 UTC
Now Valid Until: 2026-03-21 15:00 UTC
Warning Condition: Persistence
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 645
Valid From: 2026-03-20 20:20 UTC
Now Valid Until: 2026-03-21 15:00 UTC
Warning Condition: Persistence
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
Issue Time: 2026-03-21 05:17 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026-03-21 05:14 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026-03-21 05:14 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
Issue Time: 2026-03-21 05:17 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2208
Valid From: 2026-03-20 19:30 UTC
Now Valid Until: 2026-03-21 18:00 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2208
Valid From: 2026-03-20 19:30 UTC
Now Valid Until: 2026-03-21 18:00 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Issue Time: 2026-03-21 05:17 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5290
Valid From: 2026-03-20 07:19 UTC
Now Valid Until: 2026-03-21 23:59 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5290
Valid From: 2026-03-20 07:19 UTC
Now Valid Until: 2026-03-21 23:59 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Issue Time: 2026-03-21 03:32 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026-03-21 03:31 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026-03-21 03:31 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Issue Time: 2026-03-21 01:54 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026-03-21 01:54 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026-03-21 01:54 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Issue Time: 2026-03-21 01:41 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026-03-21 01:41 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026-03-21 01:41 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
Issue Time: 2026-03-21 00:34 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026-03-21 00:33 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026-03-21 00:33 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Issue Time: 2026-03-20 23:29 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026-03-20 23:28 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026-03-20 23:28 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Issue Time: 2026-03-20 23:05 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2026-03-20 23:05 UTC
Valid To: 2026-03-21 06:00 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2026-03-20 23:05 UTC
Valid To: 2026-03-21 06:00 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Issue Time: 2026-03-20 22:12 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026-03-20 22:08 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026-03-20 22:08 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
Issue Time: 2026-03-20 21:36 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026-03-20 21:26 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026-03-20 21:26 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Issue Time: 2026-03-20 21:09 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2026-03-20 20:53 UTC
Deviation: 56 nT
Station: BOU
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2026-03-20 20:53 UTC
Deviation: 56 nT
Station: BOU
Issue Time: 2026-03-20 21:04 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026-03-20 20:59 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026-03-20 20:59 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
Issue Time: 2026-03-20 20:43 UTC
WATCH: Geomagnetic Storm Category G3 Predicted
Highest Storm Level Predicted by Day
Mar 20: G3 (Strong) Mar 21: G3 (Strong) Mar 22: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G3 (Strong) geomagnetic storming is likely due to combined CME effects from events that left the Sun on 16 and 18 Mar.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
WATCH: Geomagnetic Storm Category G3 Predicted
Highest Storm Level Predicted by Day
Mar 20: G3 (Strong) Mar 21: G3 (Strong) Mar 22: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G3 (Strong) geomagnetic storming is likely due to combined CME effects from events that left the Sun on 16 and 18 Mar.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
Issue Time: 2026-03-20 20:40 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2026-03-20 20:50 UTC
Valid To: 2026-03-20 21:20 UTC
IP Shock Passage Observed: 2026-03-20 21:18 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2026-03-20 20:50 UTC
Valid To: 2026-03-20 21:20 UTC
IP Shock Passage Observed: 2026-03-20 21:18 UTC
Issue Time: 2026-03-20 20:22 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026-03-20 20:20 UTC
Valid To: 2026-03-21 06:00 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
Comment: G2 (Moderate) geomagnetic storm conditions are expected into the the early portions of 21 Mar (UTC) due to CME effects.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026-03-20 20:20 UTC
Valid To: 2026-03-21 06:00 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
Comment: G2 (Moderate) geomagnetic storm conditions are expected into the the early portions of 21 Mar (UTC) due to CME effects.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
Issue Time: 2026-03-20 20:18 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026-03-20 20:18 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026-03-20 20:18 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Issue Time: 2026-03-20 19:32 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026-03-20 19:30 UTC
Valid To: 2026-03-21 09:00 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026-03-20 19:30 UTC
Valid To: 2026-03-21 09:00 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Issue Time: 2026-03-20 14:55 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3651
Begin Time: 2026-03-15 16:30 UTC
Yesterday Maximum 2MeV Flux: 4941 pfu
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3651
Begin Time: 2026-03-15 16:30 UTC
Yesterday Maximum 2MeV Flux: 4941 pfu
Issue Time: 2026-03-20 12:39 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5289
Valid From: 2026-03-20 07:19 UTC
Now Valid Until: 2026-03-21 12:00 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5289
Valid From: 2026-03-20 07:19 UTC
Now Valid Until: 2026-03-21 12:00 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Issue Time: 2026-03-20 08:54 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026-03-20 08:54 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026-03-20 08:54 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Issue Time: 2026-03-20 07:18 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026-03-20 07:19 UTC
Valid To: 2026-03-20 15:00 UTC
Warning Condition: Onset
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026-03-20 07:19 UTC
Valid To: 2026-03-20 15:00 UTC
Warning Condition: Onset
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Issue Time: 2026-03-19 04:59 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3650
Begin Time: 2026-03-15 16:30 UTC
Yesterday Maximum 2MeV Flux: 2949 pfu
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3650
Begin Time: 2026-03-15 16:30 UTC
Yesterday Maximum 2MeV Flux: 2949 pfu
Issue Time: 2026-03-18 21:14 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day
Mar 19: G2 (Moderate) Mar 20: G2 (Moderate) Mar 21: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day
Mar 19: G2 (Moderate) Mar 20: G2 (Moderate) Mar 21: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
Built 2026-03-21 19:48 from source
