NASA StreaM

https://webtools.ccmc.gsfc.nasa.gov/DONKI/view/RBE/46199/-1

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - Continued Radiation Belt Enhancement ## ## Message Issue Date: 2026-04-23T18:50:49Z ## Message ID: 20260423-AL-006 ## ## 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 2026-04-23T13:15Z. The elevated energetic electron flux levels observed since 2026-04-19T14:00Z are caused by a coronal hole high speed stream starting on 2026-04-18, reaching maximum sustained speeds of approximately 570 km/s. The solar wind speed observed at L1 is currently around 430 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: 2026-04-19T14:00:00-RBE-001. ## Notes: This coronal hole high speed stream is also associated with the moderate geomagnetic storm with ID 2026-04-18T06:00:00-GST-001 (see notifications 20260418-AL-001, 20260418-AL-002, 20260419-AL-001).

https://webtools.ccmc.gsfc.nasa.gov/DONKI/view/RBE/45741/-1

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - Continued Radiation Belt Enhancement ## ## Message Issue Date: 2026-04-17T12:34:02Z ## Message ID: 20260417-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 2026-04-17T10:05Z. The elevated energetic electron flux levels observed since 2026-04-10T13:55Z (see notifications 20260411-AL-001, 20260413-AL-001, 20260415-AL-001) are caused by the arrival of a coronal hole high speed stream which started on 2026-04-10, reaching maximum sustained speeds of approximately 620 km/s. The solar wind speed observed at L1 is currently around 310 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: 2026-04-10T13:55:00-RBE-001. ## Notes:

https://webtools.ccmc.gsfc.nasa.gov/DONKI/view/RBE/45621/-1

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - Continued Radiation Belt Enhancement ## ## Message Issue Date: 2026-04-09T09:40:19Z ## Message ID: 20260409-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 2026-04-08T01:10Z. The elevated energetic electron flux levels observed since 2026-04-03T09:05Z (see notifications 20260403-AL-002, 20260405-AL-001, 20260407-AL-001) are likely caused by the coronal hole high speed stream detected by ACE at L1 on 2026-04-02, reaching maximum sustained speeds of approximately 700 km/s. The solar wind speed observed at L1 is currently around 370 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: 2026-04-03T09:05:00-RBE-001. ## Notes:

https://webtools.ccmc.gsfc.nasa.gov/DONKI/view/RBE/45529/-1

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - Continued Radiation Belt Enhancement ## ## Message Issue Date: 2026-04-01T16:08:12Z ## Message ID: 20260401-AL-004 ## ## 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 2026-04-01T13:10Z. The elevated energetic electron flux levels observed since 2026-03-31T14:20Z are caused by a coronal hole high speed stream which arrived on 2026-03-29, reaching maximum sustained speeds of approximately 490 km/s. The solar wind speed observed at L1 is currently around 430 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: 2026-03-31T14:20:00-RBE-001. ## Notes: Previously elevated energetic electron flux levels observed since 2026-03-22T14:15Z (see notifications 20260322-AL-003, 20260324-AL-001, 20260326-AL-001, 20260328-AL-002, and 20260330-AL-007) were likely caused by the combined arrival of the CMEs with IDs 2026-03-17T05:08:00-CME-001, 2026-03-17T06:38:00-CME-001, 2026-03-17T08:23:00-CME-001, and 2026-03-17T10:53:00-CME-001 (see notification 20260320-AL-001), as well as the arrival of CME with ID 2026-03-18T09:23:00-CME-001 (see notifications 20260318-AL-002, 20260318-AL-003, and 20260320-AL-004), and the arrival of a coronal hole high speed stream starting on 2026-03-21.

https://webtools.ccmc.gsfc.nasa.gov/DONKI/view/RBE/45469/-1

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - Continued Radiation Belt Enhancement ## ## Message Issue Date: 2026-03-30T16:34:58Z ## Message ID: 20260330-AL-007 ## ## 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 2026-03-30T14:25Z. The elevated energetic electron flux levels observed since 2026-03-22T14:15Z (see notifications 20260322-AL-003, 20260324-AL-001, 20260326-AL-001, 20260328-AL-002) are likely caused by the combined arrival of the CMEs with IDs 2026-03-17T05:08:00-CME-001, 2026-03-17T06:38:00-CME-001, 2026-03-17T08:23:00-CME-001, and ID 2026-03-17T10:53:00-CME-001 (see notification 20260320-AL-001), as well as the arrival of CME with ID 2026-03-18T09:23:00-CME-001 (see notifications 20260318-AL-002, 20260318-AL-003, and 20260320-AL-004), and the arrival of a coronal hole high speed stream starting on 2026-03-21, reaching a maximum speed of approximately 700km/s. The solar wind speed observed at L1 is currently around 450km/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: 2026-03-22T14:15:00-RBE-001. ## Notes: The arrival of the CME with ID 2026-03-18T09:23:00-CME-001 was associated with geomagnetic storm with ID 2026-03-20T18:00:00-GST-001 and modeled magnetopause crossing with ID 2026-03-20T21:13:00-MPC-001. The arrival of the coronal hole high speed stream starting on 2026-03-21 was associated with a strong geomagnetic storm with ID 2026-03-22T09:00:00-GST-001.

https://webtools.ccmc.gsfc.nasa.gov/DONKI/view/RBE/45238/-1

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - Continued Radiation Belt Enhancement ## ## Message Issue Date: 2026-03-19T16:29:03Z ## Message ID: 20260319-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 2026-03-19T05:30Z. The elevated energetic electron flux levels observed since 2026-03-15T16:05Z are caused by the arrival of a coronal hole high speed stream starting on 2026-03-13, reaching maximum sustained speeds of approximately 700 km/s (see notifications 20260315-AL-001 and 20260317-AL-001). The solar wind speed observed at L1 is currently around 345 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: 2026-03-15T16:05:00-RBE-001. ## Notes: This coronal hole high speed stream is also associated with geomagnetic storm with ID 2026-03-13T21:00:00-GST-001 (see notifications 20260314-AL-001, 20260314-AL-002, 20260314-AL-003, 20260314-AL-004).

https://webtools.ccmc.gsfc.nasa.gov/DONKI/view/RBE/45096/-1

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - Continued Radiation Belt Enhancement ## ## Message Issue Date: 2026-03-12T17:16:51Z ## Message ID: 20260312-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 2026-03-12T12:25Z. The elevated energetic electron flux levels observed since 2026-03-08T14:55Z are caused by a coronal hole high speed stream starting on 2026-03-06 (see notifications 20260308-AL-001, 20260308-AL-002, 20260310-AL-001). 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: 2026-03-08T14:55:00-RBE-001. ## Notes: