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Time
UTC		DSCOVRACE
Solar WindGSMSolar WindGSM
Proton DensityBulk SpeedBzProton DensityBulk SpeedBz
22:21------
22:20------
22:19------
22:18------
22:17--1.21---
22:164.53691.62.22---
22:15------
22:14------
22:13--0.08---
22:12---0.51---
22:11------
22:10------
22:092.78710.04.82---
22:082.78710.02.11--2.1
22:07------
22:06------
22:052.29703.92.38--2.4
22:042.29703.92.712.3703.92.7
22:03--2.67--2.7
22:02------
22:011.52697.32.381.5697.32.4
22:001.52697.32.541.5697.32.5
21:59------
21:58------
21:57------
21:561.89685.51.341.9685.51.3
21:551.89-2.181.9-2.2
21:54------
21:533.43724.52.973.4724.53.0
21:523.43724.53.123.4724.53.1
21:51--3.71--3.7
21:502.59719.0-2.6719.0-
21:492.05698.42.782.1698.42.8
21:481.64682.60.841.6682.60.8
21:47--1.43--1.4
21:462.35705.9-2.4705.9-
21:452.50727.50.222.5727.50.2
21:442.85777.8-0.282.9777.8-0.3
21:43---0.22---0.2
21:42------
21:410.91-0.790.9-0.8
21:400.91668.30.680.9668.30.7
21:390.91-1.770.9-1.8
21:38------
21:372.51705.6-2.782.5705.6-2.8
21:362.51705.6-1.552.5705.6-1.6
21:35---0.48---0.5
21:340.96691.6-1.0691.6-
21:332.01712.91.722.0712.91.7
21:322.82729.11.882.8729.11.9
21:31--1.41--1.4
21:302.32713.2-2.3713.2-
21:292.50716.01.042.5716.01.0
21:282.91722.60.722.9722.60.7
21:27--0.71--0.7
21:261.95747.7-1.9747.7-
21:251.97748.0-2.772.0748.0-2.8
21:242.62754.7-1.522.6754.7-1.5
21:232.62--0.632.6--0.6
21:22------
21:211.99740.2-0.552.0740.2-0.6
21:201.99740.2-0.582.0740.2-0.6
21:19------
21:180.98678.5-1.0678.5-
21:172.02720.6-3.502.0720.6-3.5
21:162.68750.2-3.762.7750.2-3.8
21:152.54747.7-3.482.5747.7-3.5
21:141.99724.4-2.0724.4-
21:132.11766.1-1.382.1766.1-1.4
21:122.40863.40.172.4863.40.2
21:11--0.56--0.6
21:10------
21:09---2.14---2.1
21:08---1.42---1.4
21:07---1.30---1.3
21:06------
21:052.40753.20.622.4753.20.6
21:041.69718.83.681.7718.83.7
21:031.47708.33.701.5708.33.7
21:020.92704.4-0.9704.4-
21:011.66729.3-4.451.7729.3-4.4
21:002.03749.8-4.752.0749.8-4.7
20:591.83751.4-6.011.8751.4-6.0
20:582.39752.6-2.4752.6-
20:572.44770.0-3.832.4770.0-3.8
20:562.55810.4-3.162.5810.4-3.2
20:55---1.08---1.1
20:542.31740.1-2.3740.1-
20:532.30740.0-3.152.3740.0-3.2
20:522.07736.5-2.862.1736.5-2.9
20:512.07--1.442.1--1.4
20:50------
20:492.34714.61.912.3714.61.9
20:482.59716.41.082.6716.41.1
20:472.66716.90.912.7716.90.9
20:463.69759.0-3.7759.0-
20:452.45733.20.462.5733.20.5
20:441.98725.90.662.0725.90.7
20:432.47738.2-0.102.5738.2-0.1
20:421.92698.2-1.9698.2-
20:412.40700.8-0.652.4700.8-0.7
20:403.52706.70.363.5706.70.4
20:39--0.95--0.9
20:381.98711.4-2.0711.4-
20:371.98711.4-2.422.0711.4-2.4
20:36---2.92---2.9
20:35---3.20---3.2
20:34------
20:331.42681.0-1.231.4681.0-1.2
20:322.96725.9-0.653.0725.9-0.6
20:313.43739.6-2.103.4739.6-2.1
20:302.70740.6-2.7740.6-
20:292.46709.8-2.372.5709.8-2.4
20:282.28686.2-1.982.3686.2-2.0
20:27---0.55---0.5
20:263.41722.5-3.4722.5-
20:252.74710.3-1.782.7710.3-1.8
20:241.17681.8-1.331.2681.8-1.3
20:23--0.07--0.1
20:221.62704.1-1.6704.1-
Built 2025-12-22 22:22 from source
Solar wind parameters of the latest hour by NOAA
parameterminmaxmean
IMF Bz [nT]-3.84.80.7
velocity [km/s]668.3777.8717.2
density [cm-3]0.93.42.2
Geomagnetic activity (RX [nT])
sitelatest hournext hour (RXmin, RXmax)
Kevo (KEV)29991448
Maasi (MAS)36771449
Kilpisjärvi (KIL)40476505
Ivalo (IVA)32361416
Muonio (MUO)34858453
Sodankylä (SOD)43739395
Pello (PEL)32637406
Oulujärvi (OUJ)26114250
Mekrijärvi (MEK)124793
Hankasalmi (HAN)1261097
Nurmijärvi (NUR)441073
Tartu (TAR)54841
low increasedmoderate high very high

Short explanation of the method

Data and licenses

AurorasNow! (Finnish Meteorological Institute)
Built 2025-12-22 22:17 from source
NAL | LYR | HOP | BJN | NOR | SOR | TRO | KEV | KIL | MEK | HAN | NUR | TAR
Issue Time: 2025-12-22 17:55 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5193
Valid From: 2025-12-21 02:40 UTC
Now Valid Until: 2025-12-23 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: 2025-12-22 15:00 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3580
Begin Time: 2025-12-21 14:25 UTC
Yesterday Maximum 2MeV Flux: 1566 pfu

Issue Time: 2025-12-22 14:10 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025-12-22 14:10 UTC
Synoptic Period: 1200-1500 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: 2025-12-22 14:07 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025-12-22 14:07 UTC
Valid To: 2025-12-22 23:59 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: 2025-12-21 23:16 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025-12-21 23:14 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: 2025-12-21 18:00 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025-12-21 17:59 UTC
Synoptic Period: 1500-1800 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: 2025-12-21 17:55 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5192
Valid From: 2025-12-21 02:40 UTC
Now Valid Until: 2025-12-22 18:00 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: 2025-12-21 14:45 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025-12-21 14:25 UTC
Station: GOES19


Issue Time: 2025-12-21 13:50 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025-12-21 14:00 UTC
Valid To: 2025-12-22 12:00 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: 2025-12-21 04:14 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5191
Valid From: 2025-12-21 02:40 UTC
Now Valid Until: 2025-12-21 18:00 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: 2025-12-21 03:04 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025-12-21 03:00 UTC
Synoptic Period: 0300-0600 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: 2025-12-21 02:40 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025-12-21 02:40 UTC
Valid To: 2025-12-22 23:59 UTC
Warning Condition: Onset
Comment: Onset of + CH HSS influence
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2025-12-20 12:36 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day
Dec 21: None (Below G1) Dec 22: G1 (Minor) Dec 23: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
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: 2025-12-20 08:09 UTC
ALERT: Type II Radio Emission
Begin Time: 2025-12-20 07:59 UTC
Estimated Velocity: 558 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Issue Time: 2025-12-20 04:59 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3578
Begin Time: 2025-12-17 14:05 UTC
Yesterday Maximum 2MeV Flux: 3239 pfu

Built 2025-12-22 17:57 from source