Alerts from NASA's DONKI Early Warning System (Space Weather, Sun)
NASA DONKI Notifications
NASA DONKI Notifications
Message Type: RBE
Message ID: 20260105-AL-001
Issue Time: 2026-01-05T19:44Z
Message Body: ## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI )
## Message Type: Space Weather Notification - Continued Radiation Belt Enhancement
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## Message Issue Date: 2026-01-05T19:44:25Z
## Message ID: 20260105-AL-001
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## Disclaimer: NOAA's Space Weather Prediction Center is the United States Government official source for space weather forecasts. This "Experimental Research Information" consists of preliminary NASA research products and should be interpreted and used accordingly.
## Summary:
Significantly elevated energetic electron fluxes in the Earth's outer radiation belt. GOES "greater than 2.0 MeV" integral electron flux first crossed the threshold of 1000 pfu starting at 2025-12-23T08:55Z. The most recent crossing of the 1000 pfu threshold was at 2026-01-04T14:30Z and the fluxes are currently elevated but below the threshold.
The elevated energetic electron flux levels observed since 2025-12-23T08:55Z (see notifications 20251224-AL-001, 20251226-AL-002, 20251228-AL-001, 20251230-AL-003, 20260101-AL-002) are caused by a coronal hole high speed stream starting on 2025-12-21, reaching a maximum speed of approximately 800 km/s. A subsequent coronal hole high speed stream starting on 2026-01-02 and the arrival of the CME with ID 2026-01-01T19:36:00-CME-001 as detected at L1 by DSCOVR and ACE at 2026-01-04T20:41Z may have further enhanced the electron fluxes. The solar wind speed observed at L1 is currently around 375 km/s.
NASA spacecraft at GEO, MEO and other orbits passing through or in the vicinity of the Earth's outer radiation belt can be impacted.
Message Body: ## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI )
## Message Type: Space Weather Notification - CME (Juice)
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## Message Issue Date: 2026-01-04T15:16:46Z
## Message ID: 20260104-AL-001
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## Disclaimer: NOAA's Space Weather Prediction Center is the United States Government official source for space weather forecasts. This "Experimental Research Information" consists of preliminary NASA research products and should be interpreted and used accordingly.
## Summary:
C-type CME detected by STEREO A / GOES / SOHO.
Start time of the event: 2026-01-04T05:12Z.
Estimated speed: ~524 km/s.
Estimated opening half-angle: 24 deg.
Direction (lon./lat.): 110/0 in Heliocentric Earth Equatorial coordinates.
Activity ID: 2026-01-04T05:12:00-CME-001
Based on preliminary analysis by the Moon to Mars Space Weather Analysis Office and heliospheric modeling carried out at NASA Community Coordinated Modeling Center, it is estimated that the CME may impact Juice (glancing blow). The flank of the CME may reach Juice at 2026-01-07T20:00Z (plus minus 7 hours).
Links to the movies of the modeled event (includes CME: 2026-01-04T05:12:00-CME-001):
Message Body: ## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI )
## Message Type: Space Weather Notification - Continued Radiation Belt Enhancement
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## Message Issue Date: 2026-01-03T20:03:06Z
## Message ID: 20260103-AL-001
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## Disclaimer: NOAA's Space Weather Prediction Center is the United States Government official source for space weather forecasts. This "Experimental Research Information" consists of preliminary NASA research products and should be interpreted and used accordingly.
## Summary:
Significantly elevated energetic electron fluxes in the Earth's outer radiation belt. GOES "greater than 2.0 MeV" integral electron flux remains elevated, recently crossing the threshold of 1000 pfu at 2026-01-03T19:20Z.
The elevated energetic electron flux levels observed since 2025-12-23T08:55Z (see notifications 20251224-AL-001, 20251226-AL-002, 20251228-AL-001, 20251230-AL-003, 20260101-AL-002) are caused by a coronal hole high speed stream starting on 2025-12-21, reaching a maximum speed of approximately 800 km/s. A subsequent coronal hole high speed stream starting on 2026-01-02 may have further enhanced the electron fluxes. The solar wind speed observed at L1 is currently around 500 km/s.
NASA spacecraft at GEO, MEO and other orbits passing through or in the vicinity of the Earth's outer radiation belt can be impacted.
