Message ID: 20260408-7D-001
Issue Time: 2026-04-08T21:09Z
Message Body: ## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information (CCMC DONKI)
## Message Type: Weekly Space Weather Summary Report for April 01, 2026 - April 07, 2026
##
## Message Issue Date: 2026-04-08T21:09:58Z
## Report Coverage Begin Date: 2026-04-01T00:00Z
## Report Coverage End Date: 2026-04-07T23:59Z
## Message ID: 20260408-7D-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 7 M-class flares and 10 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)
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2026-04-01T00:24Z NASA missions near Earth at at 2026-04-03T16:00Z (glancing blow), Kp index 3-4 (below minor to below minor)
(see notifications 20260401-AL-001, 20260401-AL-002).
The arrival of this CME was not detected at L1.
2026-04-01T23:45Z NASA missions near Earth at at 2026-04-04T02:49Z, Kp index 4-6 (below minor to moderate)
(see notifications 20260402-AL-001, 20260402-AL-002, 20260402-AL-005).
Ensemble: https://iswa.gsfc.nasa.gov/ENSEMBLE/2026-04-02_ncmes1_sims27_M2M-SWAO079/Detailed_results_20260401_234500_ncmes1_sims27_M2M-SWAO079.txt
The arrival of this CME was detected at L1 around 2026-04-03T15:02Z.
2026-04-02T20:46Z NASA missions near Earth at at 2026-04-05T20:00Z (glancing blow), Kp index 3-4 (below minor to below minor)
(see notifications 20260402-AL-006, 20260403-AL-001).
The arrival of this CME was not detected at L1.
It was also estimated that the following CMEs were predicted to impact the listed locations:
CME Starting time | Predicted Impacts (plus minus 7 hours)
-----------------------------------------------------------------------------
2026-04-01T00:24Z OSIRIS-APEX at 2026-04-04T02:00Z (glancing blow), Europa Clipper at 2026-04-07T09:00Z (glancing blow) (see notifications 20260401-AL-001, 20260401-AL-002).
2026-04-01T23:45Z BepiColombo at 2026-04-03T02:03Z, OSIRIS-APEX at 2026-04-04T08:01Z, STEREO A at 2026-04-04T02:03Z, Juice at 2026-04-06T06:00Z (glancing blow), Europa Clipper at 2026-04-06T11:17Z, Lucy at 2026-04-13T05:18Z (see notifications 20260402-AL-001, 20260402-AL-002, 20260402-AL-005).
2026-04-02T18:48Z OSIRIS-APEX at 2026-04-05T22:00Z (glancing blow) (see notification 20260402-AL-006).
2026-04-02T20:46Z OSIRIS-APEX at 2026-04-05T21:00Z (glancing blow) (see notifications 20260402-AL-006, 20260403-AL-001).
Geomagnetic activity was at strong levels with Kp index (a measure of geomagnetic activity, ranging 0-9) <= 6.67 for the reporting period, with two separate periods of geomagnetic storming. Geomagnetic activity was first enhanced to moderate levels with a Kp index = 5.67 during the synoptic period 2026-04-02T15:00Z to 2026-04-02T18:00Z (see notifications 20260402-AL-003, 20260402-AL-004) due to the arrival of a coronal hole high speed stream detected at L1 by ACE on 2026-04-02.
Geomagnetic activity was enhanced again, reaching strong levels with the highest value of the reporting period of Kp index = 6.67 occurring during the synoptic period 2026-04-03T15:00Z to 2026-04-03T18:00Z (see notifications 20260403-AL-004, 20260403-AL-005). This enhancement in geomagnetic activity was associated with the interplanetary shock detected at L1 by ACE and DSCOVR at 2026-04-03T15:02Z (see notification 20260403-AL-003) which was associated with the arrival of C-type CME first seen in GOES CCOR-1 at 2026-04-01T23:45Z.
The > 2.0 MeV energetic electron flux detected at GOES was elevated above the threshold level of 1000 pfu at the beginning of the reporting period due to a threshold crossing from a previous reporting period starting at 2026-03-22T14:15Z (see notifications 20260322-AL-003, 20260324-AL-001, 20260326-AL-001, 20260328-AL-002, and 20260330-AL-007). This 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 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 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. Additional enhancements may have been associated with the coronal hole high speed stream detected at L1 by ACE and DSCOVR on 2026-03-29. The fluxes returned to background levels on 2026-04-02.
The >2.0 MeV energetic electron flux levels crossed the threshold of 1000 pfu again at 2026-04-03T09:05Z (see notifications 20260403-AL-002, 20260405-AL-001, 20260407-AL-001). This subsequent elevation of energetic electron flux levels was likely associated with the arrival of a coronal hole high speed stream detected at L1 by ACE and DSCOVR on 2026-04-02. The energetic electron flux levels remained elevated through the end of the reporting period.
The energetic proton flux of >10 MeV protons at GOES as well as the flux of one or more of the >15.8 MeV proton channels at SOHO weas elevated but below threshold starting on 2026-04-01. These enhancements in solar energetic particles were associated with the X1.4 flare peaking at 2026-03-30T03:19Z from Active Region 14405 and the associated O-type CME first seen in SOHO LASCO C2 at 2026-03-30T03:24Z, the C6.1 flare peaking at 2026-04-01T23:23Z from Active Region 14403 and associated C-type CME first seen in GOES CCOR-1 at 2026-04-01T23:45Z, and possibly the M3.5 flare peaking at 2026-04-2T18:15Z from Active Region 14404 and associated C-type CME first seen in SOHO LASCO C2 at 2026-04-02T18:48Z. The proton fluxes returned to background levels on 2026-04-06. The 13-100 MeV protons at STEREO A were at near background levels for the reporting period. A brief elevation was detected by STEREO A on 2026-04-03 through 2026-04-07. This elevation was likely associated with the C6.1 flare peaking at 2026-04-01T23:23Z from Active Region 14403 and associated C-type CME first seen in GOES CCOR-1 at 2026-04-01T23:45Z and possibly the M3.5 flare peaking at 2026-04-2T18:15Z from Active Region 14404 and associated C-type CME first seen in SOHO LASCO C2 at 2026-04-02T18:48Z.
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
2026-04-02 17:23:00 18:34:00 18:15:00 M3.5 N12W18 ( 14404 )
2026-04-03 07:45:00 07:58:00 07:56:00 M1.3 N02E07 ( 14409 )
2026-04-03 12:46:00 12:52:00 12:50:00 M1.3 N02E04 ( 14409 )
2026-04-04 01:07:00 01:23:00 01:17:00 M7.5 N02W02 ( 14409 )
2026-04-04 07:38:00 08:14:00 07:58:00 M1.7 N03W07 ( 14409 )
2026-04-04 11:58:00 12:22:00 12:11:00 M1.2 N02W09 ( 14409 )
2026-04-04 22:54:00 23:14:00 23:04:00 M1.0 N03W16 ( 14409 )
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)
2026-04-01T00:24Z ~525 C 12/11 10 SOHO
2026-04-01T23:45Z ~938 C 29/25 45 GOES
2026-04-02T20:46Z ~832 C 15/20 16 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)
2026-04-01T02:36Z ~573 C -25/-33 17 SOHO, STEREO A
2026-04-01T04:36Z ~866 C -33/-20 13 SOHO, STEREO A
2026-04-01T05:09Z ~622 C -21/-28 15 STEREO A, GOES
2026-04-02T09:45Z ~579 C -130/-52 20 GOES
2026-04-02T18:48Z ~831 C 18/17 10 SOHO
2026-04-04T07:53Z ~502 C -24/19 15 STEREO A, SOHO
2026-04-05T01:48Z ~641 C NONE(POS)/-24 16 SOHO, GOES
## Space Weather Outlook:
## Outlook Coverage Begin Date: 2026-04-08T00:00Z
## Outlook Coverage End Date: 2026-04-14T23:59Z
Solar activity is expected to vary between low to moderate levels during the outlook period. There are currently eight numbered Active Regions on the Earth-facing disk. Active Region 14409 (N02W63) produced M-class flaring activity during the reporting period and may produce similar levels of flaring activity during the outlook period before it rotates around the west limb on or around 2026-04-11.
Geomagnetic activity is expected to vary between low to moderate levels during the outlook period. Three small coronal holes in the central disk (as seen in available EUV imagery from SDO/AIA 193) centered around N00W10, S23E05, and N22E18 respectively, may become geoeffective on or around 2026-04-10 to 2026-04-13. The energetic electron flux levels at GOES mentioned above exceeded the threshold of 1000 pfu at 2026-04-03T09:05Z and may continue to be elevated during the outlook period.
## 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 ID: 20260407-AL-001
Issue Time: 2026-04-07T09:40Z
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: 2026-04-07T09:40:06Z
## Message ID: 20260407-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 2026-04-07T06:15Z.
The elevated energetic electron flux levels observed since 2026-04-03T09:05Z (see notifications 20260403-AL-002, 20260405-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 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.
Activity ID: 2026-04-03T09:05:00-RBE-001.
## Notes:
URL: View Details