Message ID: 20260429-7D-001
Issue Time: 2026-04-29T20:13Z
Message Body: ## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information (CCMC DONKI)
## Message Type: Weekly Space Weather Summary Report for April 22, 2026 - April 28, 2026
##
## Message Issue Date: 2026-04-29T20:13:46Z
## Report Coverage Begin Date: 2026-04-22T00:00Z
## Report Coverage End Date: 2026-04-28T23:59Z
## Message ID: 20260429-7D-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 high levels during this reporting period with 2 X-class flares and 20 M-class flares, 1 O-type CME, and 13 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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2026-04-23T05:12Z NASA missions near Earth at at 2026-04-26T00:45Z, Kp index 3-5 (below minor to minor)
(see notifications 20260423-AL-001, 20260424-AL-007).
The arrival of this CME was detected at L1 around 2026-04-25T19:28Z.
2026-04-23T12:08Z NASA missions near Earth at at 2026-04-26T20:00Z (glancing blow), Kp index 2-4 (below minor)
(see notifications 20260423-AL-005).
The arrival of this CME was not detected at L1.
2026-04-24T01:24Z NASA missions near Earth at at 2026-04-27T02:00Z, Kp index 2-3 (below minor)
(see notifications 20260424-AL-003, 20260424-AL-010).
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)
-----------------------------------------------------------------------------
2026-04-22T23:24Z Juice at 2026-04-26T20:00Z (glancing blow), STEREO A at 2026-04-25T08:00Z (glancing blow) (see notification 20260423-AL-003).
2026-04-23T05:00Z STEREO A at 2026-04-25T09:00Z, Juice at 2026-04-26T20:00Z (glancing blow) (see notification 20260423-AL-002).
2026-04-23T05:12Z Europa Clipper at 2026-04-29T06:00Z (glancing blow), OSIRIS-APEX at 2026-04-27T03:00Z (glancing blow), Lucy at 2026-05-07T06:00Z (glancing blow) (see notifications 20260423-AL-001, 20260424-AL-007).
2026-04-23T09:12Z Juice at 2026-04-26T23:37Z, STEREO A at 2026-04-25T10:37Z, Europa Clipper at 2026-04-28T02:00Z (glancing blow), OSIRIS-APEX at 2026-04-26T12:00Z (glancing blow) (see notification 20260423-AL-004).
2026-04-23T14:24Z Juice at 2026-04-27T01:46Z, OSIRIS-APEX at 2026-04-27T11:26Z, Parker Solar Probe at 2026-04-25T16:29Z, STEREO A at 2026-04-25T22:17Z, Europa Clipper at 2026-04-29T04:00Z (Minor Impact), BepiColombo at 2026-04-25T02:00Z (Glancing Blow) (see notification 20260424-AL-010).
2026-04-23T16:30Z Juice at 2026-04-27T01:46Z, OSIRIS-APEX at 2026-04-27T11:26Z, Parker Solar Probe at 2026-04-25T16:29Z, STEREO A at 2026-04-25T22:17Z, Europa Clipper at 2026-04-29T04:00Z (Minor Impact), BepiColombo at 2026-04-25T02:00Z (Glancing Blow) (see notification 20260424-AL-010).
2026-04-23T18:00Z Juice at 2026-04-27T01:46Z, OSIRIS-APEX at 2026-04-27T11:26Z, Parker Solar Probe at 2026-04-25T16:29Z, STEREO A at 2026-04-25T22:17Z, Europa Clipper at 2026-04-29T04:00Z (Minor Impact), BepiColombo at 2026-04-25T02:00Z (Glancing Blow) (see notification 20260424-AL-010).
2026-04-24T01:24Z Juice at 2026-04-27T01:46Z, OSIRIS-APEX at 2026-04-27T11:26Z, Parker Solar Probe at 2026-04-25T16:29Z, STEREO A at 2026-04-25T22:17Z, Europa Clipper at 2026-04-29T04:00Z (Minor Impact), BepiColombo at 2026-04-25T02:00Z (Glancing Blow) (see notifications 20260424-AL-003, 20260424-AL-010).
2026-04-24T08:24Z Juice at 2026-04-27T01:46Z, OSIRIS-APEX at 2026-04-27T11:26Z, Parker Solar Probe at 2026-04-25T16:29Z, STEREO A at 2026-04-25T22:17Z, Europa Clipper at 2026-04-29T04:00Z (Minor Impact), BepiColombo at 2026-04-25T02:00Z (Glancing Blow) (see notifications 20260424-AL-006, 20260424-AL-010).
2026-04-24T19:30Z STEREO A at 2026-04-27T12:00Z (minor impact), Juice at 2026-04-29T04:00Z (glancing blow), Parker Solar Probe at 2026-04-26T12:00Z (glancing blow) (see notification 20260425-AL-001).
Geomagnetic activity was at below minor levels with Kp index (a measure of geomagnetic activity, ranging 0-9) <= 3.67 for the reporting period.
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 2026-04-19T14:00Z (see notifications 20260419-AL-002, 20260421-AL-001, 20260423-AL-006). This elevation of energetic electron flux levels was likely associated with the arrival of a coronal hole high speed stream detected at L1 by ACE on 2026-04-18. The fluxes returned to background levels on 2026-04-24.
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
2026-04-23 04:24:00 04:40:00 04:35:00 M1.6 N15W60 ( 14419 )
2026-04-23 04:41:00 04:46:00 04:44:00 M1.2 N16E40 ( 14420 )
2026-04-23 04:50:00 05:08:00 04:59:00 M1.2 N16E35 ( 14420 )
2026-04-23 08:40:00 08:53:00 08:48:00 M4.3 N15W61 ( 14419 )
2026-04-23 13:42:00 14:11:00 14:00:00 M1.7 N17W66 ( 14419 )
2026-04-23 17:00:00 17:14:00 17:08:00 M4.9 N15W67 ( 14419 )
2026-04-24 00:51:00 01:13:00 01:07:00 X2.4 N16W68 ( 14419 )
2026-04-24 08:01:00 08:18:00 08:13:00 X2.5 N16W70 ( 14419 )
2026-04-24 08:57:00 09:19:00 09:07:00 M1.9 S05E40 ( 14423 )
2026-04-24 12:34:00 13:14:00 13:01:00 M1.7 S06E38 ( 14423 )
2026-04-24 17:54:00 18:30:00 18:15:00 M6.4 N15W78 ( 14419 )
2026-04-25 07:56:00 08:03:00 07:59:00 M1.3 S05E27 ( 14423 )
2026-04-25 14:22:00 14:32:00 14:30:00 M1.1 N07E70 ( 14425 )
2026-04-26 00:08:00 00:35:00 00:23:00 M1.3 N06E64 ( 14425 )
2026-04-26 13:54:00 14:08:00 14:03:00 M1.4 N15W15 ( 14420 )
2026-04-26 19:18:00 19:27:00 19:24:00 M1.7 N17W14 ( 14420 )
2026-04-26 19:54:00 20:07:00 20:04:00 M2.2 N06E52 ( 14425 )
2026-04-26 22:51:00 23:02:00 22:57:00 M6.0 N15W18 ( 14420 )
2026-04-27 06:39:00 06:50:00 06:45:00 M1.0 N06E44 ( 14425 )
2026-04-28 12:17:00 12:29:00 12:23:00 M1.0 N14W39 ( 14420 )
2026-04-28 13:49:00 13:55:00 13:53:00 M1.5 N16W38 ( 14420 )
2026-04-28 14:03:00 14:09:00 14:07:00 M1.1 N16W40 ( 14420 )
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)
2026-04-23T05:12Z ~889 C -40/16 38 SOHO, STEREO A, GOES
2026-04-23T12:08Z ~621 C -20/14 14 STEREO A, SOHO, GOES
2026-04-24T01:24Z ~772 C 37/30 38 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)
2026-04-22T23:24Z ~849 C 53/31 19 SOHO, GOES
2026-04-23T05:00Z ~947 C 52/31 24 SOHO, STEREO A, GOES
2026-04-23T09:12Z ~851 C 49/28 31 SOHO, STEREO A, GOES
2026-04-23T18:00Z ~637 C 46/37 28 GOES, STEREO A
2026-04-23T19:15Z ~632 C NONE(POS)/68 22 GOES
2026-04-23T22:24Z ~680 C -90/16 10 SOHO, GOES
2026-04-24T08:24Z ~1237 O 63/36 45 SOHO, STEREO A, GOES
2026-04-24T09:08Z ~860 C -49/3 16 STEREO A, GOES
2026-04-24T19:30Z ~575 C 78/37 35 GOES, SOHO
2026-04-25T15:08Z ~558 C -71/-9 17 SOHO, STEREO A, GOES
2026-04-28T16:48Z ~664 C -173/-48 17 SOHO, STEREO A, GOES
## Space Weather Outlook:
## Outlook Coverage Begin Date: 2026-04-29T00:00Z
## Outlook Coverage End Date: 2026-05-05T23:59Z
Solar activity is expected to vary between low to moderate levels during the outlook period. There are currently six numbered Active Regions on the Earth-facing disk. Active Region 14419 produced two X-class flares and more M-class flares early in the reporting period, rotating beyond the western limb of the Earth-facing disk on 2026-04-25. Active Regions 14420 (N16W53) and 14425 (N05E12) produced the majority of M-class flaring over the reporting period and may produce similar levels of flaring activity during the outlook period.
Geomagnetic activity is expected to vary between low to moderate levels during the outlook period. Two coronal holes centered around S20W30 and N40E10 (as seen in available EUV imagery from SDO/AIA 193) may become geoeffective on or around 2026-04-29 and 2026-05-02 respectively.
## 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
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