Message Type: RBE
Message ID: 20260326-AL-001
Issue Time: 2026-03-26T16:06Z
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: 2026-03-26T16:06:53Z
## Message ID: 20260326-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 2026-03-25T08:15Z.
The elevated energetic electron flux levels observed since 2026-03-22T14:15Z (see notifications 20260322-AL-003, 20260324-AL-001) are likely caused by the combined arrival of CME with ID 2026-03-17T05:08:00-CME-001, CME with ID 2026-03-17T06:38:00-CME-001, CME with ID 2026-03-17T08:23:00-CME-001 and CME with ID 2026-03-17T10:53:00-CME-001 (see notification 20260320-AL-001), 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 460km/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 a strong 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.
URL: View Details
Message Type: Report
Message ID: 20260325-7D-001
Issue Time: 2026-03-25T18:28Z
Message Body: ## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information (CCMC DONKI)
## Message Type: Weekly Space Weather Summary Report for March 18, 2026 - March 24, 2026
##
## Message Issue Date: 2026-03-25T18:28:03Z
## Report Coverage Begin Date: 2026-03-18T00:00Z
## Report Coverage End Date: 2026-03-24T23:59Z
## Message ID: 20260325-7D-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:
Solar activity was at moderate levels during this reporting period with 1 M-class flare, 1 O-type CME, and 8 C-type CMEs (see details below).
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 was estimated that the following CMEs were predicted to impact missions near Earth:
CME Starting time | Predicted Impacts (plus minus 7 hours)
-----------------------------------------------------------------------------
2026-03-18T09:23Z NASA missions near Earth at at 2026-03-20T17:24Z, Kp index 5-7 (minor to strong)
(see notifications 20260318-AL-002, 20260318-AL-003).
Ensemble: https://iswa.gsfc.nasa.gov/ENSEMBLE/2026-03-18_ncmes1_sims36_M2M-SWAO076/Detailed_results_20260318_092300_ncmes1_sims36_M2M-SWAO076.txt
The arrival of this CME was detected at L1 around 2026-03-20T20:17Z.
2026-03-22T16:23Z NASA missions near Earth at at 2026-03-25T08:55Z, Kp index 3-5 (below minor to minor)
(see notifications 20260323-AL-001, 20260323-AL-002).
Ensemble: https://iswa.gsfc.nasa.gov/ENSEMBLE/2026-03-22_ncmes1_sims26_M2M-SWAO077/Detailed_results_20260322_162300_ncmes1_sims26_M2M-SWAO077.txt
The arrival of this CME was likely detected at L1 around 2026-03-25T05:53Z.
It was also estimated that the following CMEs were predicted to impact the listed locations:
CME Starting time | Predicted Impacts (plus minus 7 hours)
-----------------------------------------------------------------------------
2026-03-18T09:23Z BepiColombo at 2026-03-19T10:33Z, OSIRIS-APEX at 2026-03-21T07:08Z, STEREO A at 2026-03-20T18:00Z (glancing blow), Europa Clipper at 2026-03-23T18:00Z (glancing blow), Lucy at 2026-03-30T20:00Z (glancing blow) (see notifications 20260318-AL-002, 20260318-AL-003).
2026-03-20T12:23Z Solar Orbiter at 2026-03-21T10:15Z, Mars at 2026-03-25T14:00Z (glancing blow), Psyche at 2026-03-26T02:00Z (glancing blow) (see notification 20260320-AL-002).
2026-03-20T12:38Z Solar Orbiter at 2026-03-21T10:15Z, Mars at 2026-03-25T14:00Z (glancing blow), Psyche at 2026-03-26T02:00Z (glancing blow) (see notification 20260320-AL-002).
2026-03-22T23:24Z BepiColombo at 2026-03-24T00:33Z, Juice at 2026-03-27T05:41Z, STEREO A at 2026-03-25T05:20Z, OSIRIS-APEX at 2026-03-25T20:00Z (glancing blow), Europa Clipper at 2026-03-28T00:00Z (glancing blow) (see notification 20260323-AL-003).
2026-03-23T02:36Z BepiColombo at 2026-03-24T00:33Z, Juice at 2026-03-27T05:41Z, STEREO A at 2026-03-25T05:20Z, OSIRIS-APEX at 2026-03-25T20:00Z (glancing blow), Europa Clipper at 2026-03-28T00:00Z (glancing blow) (see notification 20260323-AL-003).
Geomagnetic activity was at strong levels with Kp index (a measure of geomagnetic activity, ranging 0-9) <= 7.00 for the reporting period. The highest value of Kp = 7.00 occurred during the synoptic period of 2026-03-21T00:00Z to 2026-03-21T03:00Z (see notifications 20260320-AL-003, 20260320-AL-006, 20260321-AL-001, 20260321-AL-002, 20260321-AL-003, 20260321-AL-004). This enhancement in geomagnetic activity was associated with the interplanetary shock detected at L1 by ACE and DSCOVR at 2026-03-20T20:17Z (see notification 20260320-AL-004) which was associated with the arrival of C-type CME first seen in STEREO A COR2 at 2026-03-18T09:23Z. Simulations indicated that the magnetopause separating magnetospheric and solar wind plasma was close to geosynchronous orbit starting at 2026-03-20T21:13Z (see notification 20260320-AL-005).
Geomagnetic activity was enhanced again, reaching strong levels with Kp index = 6.67 for the non-concurrent synoptic periods of 2026-03-22T09:00Z to 2026-03-22T12:00Z and 2026-03-22T15:00Z to 2026-03-22T18:00Z (see notifications 20260322-AL-001, 20260322-AL-002, 20260322-AL-004) due to the arrival of a coronal hole high speed stream detected at L1 by DSCOVR and ACE on 2026-03-21.
The > 2.0 MeV energetic electron flux detected at GOES remained elevated above the threshold level of 1000 pfu at the beginning of the reporting period due to a threshold crossing from the previous reporting period starting at 2026-03-15T16:05Z (see notifications 20260315-AL-001, 20260317-AL-001, 20260319-AL-001). This elevation of energetic electron flux levels was associated with the interplanetary shock detected at L1 by ACE at 2026-03-13T07:06Z which was likely associated with the arrival of a coronal hole high speed stream detected at L1 by ACE and DSCOVR on 2026-03-13. The fluxes returned to background levels on 2026-03-21.
The >2.0 MeV energetic electron flux levels crossed the threshold of 1000 pfu again at 2026-03-22T14:15Z (see notifications 20260322-AL-003, 20260324-AL-001). This subsequent elevation of energetic electron flux levels was likely associated with the interplanetary shock detected at L1 by ACE and DSCOVR at 2026-03-20T01:31Z (see notification 20260320-AL-001) which was associated with the combined arrival of S-type CMEs first seen in in STEREO A COR2 at 2026-03-17T05:08Z, 2026-03-17T06:38Z, 2026-03-17T08:23Z, and 2026-03-17T10:53Z, the interplanetary shock detected at L1 by ACE and DSCOVR at 2026-03-20T20:17Z (see notification 20260320-AL-004) which was associated with the arrival of C-type CME first seen in STEREO A COR2 at 2026-03-18T09:23Z, and the arrival of a coronal hole high speed stream detected at L1 by ACE and DSCOVR on 2026-03-21. The energetic electron flux levels remained elevated through the end of the reporting period.
The energetic proton flux of >10 MeV protons detected at GOES, the flux of one or more of the >15.8 MeV proton channels detected at SOHO, and the 13-100 MeV protons at STEREO A were all at near background levels for the entire reporting period.
Space Weather Impact:
Space weather impacts on NASA spacecraft are expected to have been moderate this reporting period due to the elevated energetic electron flux in the Earth's outer radiation belt described above.
##Events:
Flares (M-class and above)
Date Start Stop Peak Class Location
2026-03-18 08:26:00 08:57:00 08:42:00 M2.7 S16W05 ( 14392 )
CMEs (>500 km/s):
Earth directed:
Starting time Speed (km/s) Type Direction (LON/LAT in HEEQ) Half-Angle width (degrees) Detecting spacecraft (real-time)
2026-03-18T09:23Z ~731 C 19/-6 28 STEREO A, SOHO, GOES
2026-03-22T16:23Z ~655 C -34/-36 38 STEREO A, SOHO, GOES
Non-Earth directed (POS = Plane Of Sky):
Starting time Speed (km/s) Type Direction (LON/LAT in HEEQ) Half-Angle width (degrees) Detecting spacecraft (real-time)
2026-03-20T12:23Z ~802 C -177/3 35 STEREO A, SOHO, GOES
2026-03-20T12:38Z ~1095 O -170/-2 42 STEREO A, SOHO, GOES
2026-03-21T04:00Z ~504 C -76/8 11 SOHO, STEREO A
2026-03-21T07:24Z ~536 C NONE(POS)/9 17 SOHO
2026-03-22T18:12Z ~542 C NONE(POS)/-38 18 SOHO, GOES
2026-03-22T23:24Z ~739 C 84/7 40 SOHO, STEREO A, GOES
2026-03-23T02:36Z ~551 C 78/-18 40 SOHO, STEREO A, GOES
## Space Weather Outlook:
## Outlook Coverage Begin Date: 2026-03-25T00:00Z
## Outlook Coverage End Date: 2026-03-31T23:59Z
Solar activity is expected to vary between low and moderate levels during the outlook period. There are currently seven numbered Active Regions on the Earth-facing disk. Active Region 14392 produced M-class level flaring activity during the reporting period before rotating off the Earth-facing disk on 2026-03-24. An unnumbered active region located beyond the NE limb around latitude N13 is expected to rotate onto the Earth-facing disk early in the outlook period and has already produced C-class level flaring and associated S-type CME activity. Both regions may continue to produce similar levels of flaring activity during the outlook period.
Geomagnetic activity is expected to vary between low and moderate levels during the outlook period. The energetic electron flux levels at GOES exceeded the threshold of 1000 pfu starting at 2026-03-22T14:15Z (see notifications 20260322-AL-003, 20260324-AL-001) and may continue to be elevated during the outlook period. A coronal hole centered around N15E05 (as seen in available imagery from GOES/SUVI 195) may reach geoeffective longitudes on or around 2026-03-28.
## 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
Message Type: CME
Message ID: 20260325-AL-001
Issue Time: 2026-03-25T13:27Z
Message Body: ## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI )
## Message Type: Space Weather Notification - CME (Europa Clipper, BepiColombo, STEREO A, Juice, OSIRIS-APEX, Parker Solar Probe)
##
## Message Issue Date: 2026-03-25T13:27:42Z
## Message ID: 20260325-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:
O-type CME detected by GOES / SOHO.
Start time of the event: 2026-03-25T00:45Z.
Estimated speed: ~1208 km/s.
Estimated opening half-angle: 23 deg.
Direction (lon./lat.): 68/-19 in Heliocentric Earth Equatorial coordinates.
Activity ID: 2026-03-25T00:45:00-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 Europa Clipper (glancing blow), BepiColombo, STEREO A, Juice (minor impact), OSIRIS-APEX (glancing blow), and Parker Solar Probe (glancing blow). The leading edge of the CME will reach BepiColombo at 2026-03-25T17:26Z, STEREO A at 2026-03-26T17:30Z, and Juice at 2026-03-28T12:00Z (plus minus 7 hours). The flank of the CME may reach Europa Clipper at 2026-03-29T12:00Z, OSIRIS-APEX at 2026-03-27T20:00Z, and Parker Solar Probe at 2026-03-26T08:00Z (plus minus 7 hours).
Links to the movies of the modeled event (includes CME: 2026-03-25T00:45:00-CME-001):
(a) 2 AU outer boundary
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_2.0_anim.tim-den.gif
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_2.0_anim.tim-vel.gif
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_2.0_anim.tim-den-Stereo_A.gif
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_2.0_anim.tim-vel-Stereo_A.gif
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_2.0_ENLIL_CONE_timeline.gif
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_2.0_ENLIL_CONE_PSP_timeline.gif
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_2.0_ENLIL_CONE_STA_timeline.gif
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_2.0_ENLIL_CONE_Bepi_timeline.gif
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_2.0_ENLIL_CONE_Juice_timeline.gif
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_2.0_ENLIL_CONE_Osiris_timeline.gif
(b) 5.5 AU outer boundary
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_5.5_anim.tim-den.gif
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_5.5_anim.tim-vel.gif
https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260325_032100_5.5_ENLIL_CONE_EuropaClippr_timeline.gif
## Notes:
This CME event (2026-03-25T00:45:00-CME-001) is associated with C2.9 flare from Active Region 14400 (S14W52) with ID 2026-03-24T23:52:00-FLR-001 which peaked at 2026-03-25T00:12Z.
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:
Message Type: RBE
Message ID: 20260324-AL-001
Issue Time: 2026-03-24T16:06Z
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: 2026-03-24T16:06:50Z
## Message ID: 20260324-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 2026-03-24T02:30Z.
The elevated energetic electron flux levels observed since 2026-03-22T14:15Z (see notification 20260322-AL-003) are likely caused by the combined arrival of CME with ID 2026-03-17T05:08:00-CME-001, CME with ID 2026-03-17T06:38:00-CME-001, CME with ID 2026-03-17T08:23:00-CME-001 and CME with ID 2026-03-17T10:53:00-CME-001 (see notification 20260320-AL-001), 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 570km/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 a strong 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.
URL: View Details
