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SeadedLast update:
Time
UTC		DSCOVRACE
Solar WindGSMSolar WindGSM
Proton DensityBulk SpeedBzProton DensityBulk SpeedBz
14:46------
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14:28------
14:27---4.1454.97.2
14:26---4.3445.47.0
14:25---4.3444.96.4
14:24---3.9438.96.8
14:23---3.9447.46.1
14:22---4.3448.05.9
14:21---4.0440.56.1
14:20---4.9432.93.8
14:19---5.1431.52.8
14:18---5.4437.63.4
14:17---4.7438.33.4
14:16---4.9436.44.6
14:15---5.4434.63.0
14:14-----2.9
14:13---4.9436.11.4
14:12---5.1433.02.0
14:11---5.3434.02.6
14:10---5.5436.33.4
14:09---5.4434.83.0
14:08---4.9428.03.1
14:07---5.2427.33.7
14:06---5.2-4.6
14:05-----3.9
14:04---5.2434.63.4
14:03---4.9431.92.7
14:02---4.4435.41.9
14:01---4.6438.60.7
14:00---4.7439.4-1.2
13:59------
13:58---4.3444.3-
13:57---4.6441.8-0.7
13:56---3.8445.2-0.8
13:55---3.8444.5-0.3
13:54---4.0442.11.8
13:53---4.8440.33.0
13:52---4.4438.14.1
13:51---4.8439.94.0
13:50---4.5436.24.3
13:49---4.5434.93.8
13:48---4.8438.94.5
13:47---4.8439.31.9
13:46---4.6436.01.5
13:45---4.8435.30.7
13:44---4.3435.81.9
13:43---4.1432.71.1
13:42---4.4429.94.2
13:41---4.3430.54.4
13:40------
13:39------
13:38------
13:37------
13:36-----6.5
13:35-----4.5
13:34---3.4393.73.0
13:33---3.4393.74.1
13:32---6.0465.43.5
13:31---5.5459.72.7
13:30---4.6463.20.3
13:29---3.3435.1-1.5
13:28---4.4426.2-0.2
13:27---5.5442.10.7
13:26---4.9445.91.3
13:25---4.4446.90.1
13:24---4.4457.5-0.7
13:23---4.3448.51.0
13:22---4.9439.0-0.9
13:21---4.7414.30.9
13:20---3.3416.3-0.8
13:19---5.3418.10.1
13:18---5.3439.91.1
13:17---3.1410.00.2
13:16---10.7440.1-0.0
13:15---7.8448.20.5
13:14---4.8441.21.8
13:13---7.3429.6-0.1
13:12---6.9437.3-0.1
13:11---5.1455.10.3
13:10---4.5439.42.4
13:09---4.8426.63.0
13:08---5.8456.52.3
13:07---6.5452.71.8
13:06---9.3439.31.2
13:05---7.9409.62.3
13:04---5.6443.92.0
13:03---13.6428.8-0.1
13:02---6.3436.71.5
13:01---4.2401.01.4
13:00---4.0397.01.9
12:59------
12:58---4.4413.14.5
12:57---4.6413.43.9
12:56---7.2428.04.2
12:55---5.3408.33.7
12:54---2.4383.73.8
12:53---3.7392.95.8
12:52---4.5406.25.9
12:51---4.2406.55.8
12:50---3.8398.05.7
12:49---2.4380.66.0
12:48---3.5399.16.6
12:47---3.3397.36.3
Built 2026-08-18 14:47 from source
Solar wind parameters of the latest hour by NOAA
parameterminmaxmean
IMF Bz [nT]3.07.24.7
velocity [km/s]417.6468.3433.2
density [cm-3]7.210.78.7
Geomagnetic activity (RX [nT])
sitelatest hournext hour (RXmin, RXmax)
Kevo (KEV)49480
Maasi (MAS)51573
Kilpisjärvi (KIL)61466
Ivalo (IVA)49451
Muonio (MUO)55459
Sodankylä (SOD)61450
Pello (PEL)58441
Oulujärvi (OUJ)-435
Mekrijärvi (MEK)45227
Hankasalmi (HAN)-326
Nurmijärvi (NUR)49328
Tartu (TAR)38219
low increasedmoderate high very high

Short explanation of the method

Data and licenses

AurorasNow! (Finnish Meteorological Institute)
Built 2026-08-18 14:47 from source
NAL | LYR | HOP | BJN | NOR | SOR | TRO | KEV | KIL | MEK | HAN | NUR | TAR
Issue Time: 2026-08-18 14:31 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5403
Valid From: 2026-08-17 21:01 UTC
Now Valid Until: 2026-08-18 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: 2026-08-18 05:06 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026-08-18 05:05 UTC
Synoptic Period: 0300-0600
Active Warning: YES
Noaa Scale: G1 - Minor
Comment
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: 2026-08-18 02:27 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5402
Valid From: 2026-08-17 21:01 UTC
Now Valid Until: 2026-08-18 15:00 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: 2026-08-18 02:27 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026-08-18 02:24 UTC
Valid To: 2026-08-18 12:00 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor
Comment
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: 2026-08-17 22:46 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day
Aug 18: None (Below G1) Aug 19: G1 (Minor) Aug 20: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment
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: 2026-08-17 21:05 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026-08-17 20:59 UTC
Synoptic Period: 1800-2100
Active Warning: YES
Comment
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2026-08-17 21:01 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026-08-17 21:01 UTC
Valid To: 2026-08-18 06:00 UTC
Warning Conditions: Onset
Comment
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2026-08-17 17:19 UTC
ALERT: Type II Radio Emission
Begin Time: 2026-08-17 16:37 UTC
Estimate Velocity: 825 km/s
Comment

Built 2026-08-18 14:33 from source