Message Type: RBE

Message ID: 20251220-AL-001

Issue Time: 2025-12-20T18:30Z

Message Body: ## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI )
## Message Type: Space Weather Notification - Continued Radiation Belt Enhancement
##
## Message Issue Date: 2025-12-20T18:30:20Z
## Message ID: 20251220-AL-001
##
## 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 2025-12-20T06:55Z.

The elevated energetic electron flux levels observed since 2025-12-16T18:15Z are caused by the arrival of a coronal hole high speed stream starting on 2025-12-12, reaching sustained speeds of approximately 715 km/s (see notifications 20251216-AL-001, 20251216-AL-002, 20251218-AL-001). The solar wind speed observed at L1 is currently around 420 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.

Activity ID: 2025-12-16T18:15:00-RBE-001.

## Notes:

URL: View Details

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Message Type: CME

Message ID: 20251219-AL-001

Issue Time: 2025-12-19T13:30Z

Message Body: ## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI )
## Message Type: Space Weather Notification - CME (BepiColombo, Juice)
##
## Message Issue Date: 2025-12-19T13:30:15Z
## Message ID: 20251219-AL-001
##
## 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: 2025-12-19T01:25Z.

Estimated speed: ~833 km/s.

Estimated opening half-angle: 11 deg.

Direction (lon./lat.): 126/-8 in Heliocentric Earth Equatorial coordinates.

Activity ID: 2025-12-19T01:25:00-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 BepiColombo and Juice (glancing blow). The leading edge of the CME may reach BepiColombo at 2025-12-19T23:47Z and the flank of the CME may reach Juice at 2025-12-21T23:00Z (plus minus 7 hours).

Links to the movies of the modeled event (includes CME: 2025-12-19T01:25:00-CME-001):

http://iswa.gsfc.nasa.gov/downloads/20251219_054800_2.0_anim.tim-den.gif
http://iswa.gsfc.nasa.gov/downloads/20251219_054800_2.0_anim.tim-vel.gif
http://iswa.gsfc.nasa.gov/downloads/20251219_054800_2.0_ENLIL_CONE_timeline.gif
http://iswa.gsfc.nasa.gov/downloads/20251219_054800_2.0_ENLIL_CONE_Bepi_timeline.gif
http://iswa.gsfc.nasa.gov/downloads/20251219_054800_2.0_ENLIL_CONE_Juice_timeline.gif


## Notes:


SCORE CME typification system:
S-type: CMEs with speeds less than 500 km/s
C-type: Common 500-999 km/s
O-type: Occasional 1000-1999 km/s
R-type: Rare 2000-2999 km/s
ER-type: Extremely Rare >3000 km/s

URL: View Details

GIFs:

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