Message Type: CME
Message ID: 20260530-AL-001
Issue Time: 2026-05-30T17:04Z
Message Body: ## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI )
## Message Type: Space Weather Notification - CME (Juno, Solar Orbiter, BepiColombo)
##
## Message Issue Date: 2026-05-30T17:04:24Z
## Message ID: 20260530-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: 2026-05-30T08:38Z.
Estimated speed: ~776 km/s.
Estimated opening half-angle: 51 deg.
Direction (lon./lat.): -168/23 in Heliocentric Earth Equatorial coordinates.
Activity ID: 2026-05-30T08:38:00-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 Juno (glancing blow), Solar Orbiter, and BepiColombo (glancing blow). The leading edge of the CME may reach Solar Orbiter at 2026-06-01T05:11Z, and the flank of the CME may reach Juno at 2026-06-13T12:00Z and BepiColombo at 2026-05-31T14:00Z (plus minus 7 hours).
Links to the movies of the modeled event (includes CME: 2026-05-30T08:38:00-CME-001):
(a) 2 AU outer boundary
https://iswa.gsfc.nasa.gov/api/redirect?filename=20260530_125900_2.0_anim.tim-den.gif
https://iswa.gsfc.nasa.gov/api/redirect?filename=20260530_125900_2.0_anim.tim-vel.gif
https://iswa.gsfc.nasa.gov/api/redirect?filename=20260530_125900_2.0_ENLIL_CONE_timeline.gif
https://iswa.gsfc.nasa.gov/api/redirect?filename=20260530_125900_2.0_ENLIL_CONE_Bepi_timeline.gif
https://iswa.gsfc.nasa.gov/api/redirect?filename=20260530_125900_2.0_ENLIL_CONE_SolO_timeline.gif
(b) 5.5 AU outer boundary
https://iswa.gsfc.nasa.gov/api/redirect?filename=20260530_125900_5.5_anim.tim-den.gif
https://iswa.gsfc.nasa.gov/api/redirect?filename=20260530_125900_5.5_anim.tim-vel.gif
https://iswa.gsfc.nasa.gov/api/redirect?filename=20260530_125900_5.5_ENLIL_CONE_Juno_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:
Message Type: Report
Message ID: 20260527-7D-001
Issue Time: 2026-05-27T19:53Z
Message Body: ## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information (CCMC DONKI)
## Message Type: Weekly Space Weather Summary Report for May 20, 2026 - May 26, 2026
##
## Message Issue Date: 2026-05-27T19:53:28Z
## Report Coverage Begin Date: 2026-05-20T00:00Z
## Report Coverage End Date: 2026-05-26T23:59Z
## Message ID: 20260527-7D-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 1 M-class flare, 2 O-type CMEs, and 20 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 the listed locations:
CME Starting time | Predicted Impacts (plus minus 7 hours)
-----------------------------------------------------------------------------
2026-05-20T17:15Z Juice at 2026-05-24T11:19Z, STEREO A at 2026-05-22T22:16Z (see notifications 20260520-AL-002, 20260521-AL-001).
2026-05-22T10:48Z Parker Solar Probe at 2026-05-23T18:09Z (see notification 20260522-AL-001).
2026-05-23T16:00Z Parker Solar Probe at 2026-05-24T19:22Z, STEREO A at 2026-05-26T13:26Z, Juice at 2026-05-28T20:00Z (glancing blow) (see notification 20260523-AL-001).
2026-05-23T20:30Z Parker Solar Probe at 2026-05-25T00:45Z, Mars at 2026-05-27T08:00Z (glancing blow), Psyche at 2026-05-27T07:00Z (glancing blow) (see notification 20260524-AL-001).
2026-05-24T09:12Z Parker Solar Probe at 2026-05-25T11:37Z, Mars at 2026-05-28T00:00Z (glancing blow), Psyche at 2026-05-27T21:00Z (glancing blow), STEREO A at 2026-05-27T20:00Z (glancing blow) (see notification 20260524-AL-002).
2026-05-25T22:12Z Mars at 2026-05-28T10:09Z, Parker Solar Probe at 2026-05-26T19:34Z, Psyche at 2026-05-28T09:01Z (see notifications 20260526-AL-002, 20260526-AL-006).
2026-05-25T23:24Z Mars at 2026-05-28T13:05Z, Parker Solar Probe at 2026-05-26T20:56Z, Psyche at 2026-05-28T11:51Z (see notification 20260526-AL-007).
2026-05-26T00:48Z Mars at 2026-05-28T13:05Z, Parker Solar Probe at 2026-05-26T20:56Z, Psyche at 2026-05-28T11:51Z (see notification 20260526-AL-007).
2026-05-26T02:12Z Parker Solar Probe at 2026-05-27T02:24Z, Mars at 2026-05-29T08:00Z (minor impact), and Psyche at 2026-05-29T06:00Z (minor impact) (see notification 20260526-AL-008).
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 2026-05-16T15:20Z (see notifications 20260516-AL-003, 20260516-AL-004, 20260518-AL-001, 20260520-AL-001, 20260522-AL-002, 20260524-AL-003). 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 and DSCOVR on 2026-05-15. The fluxes returned to background levels on 2026-05-24.
A solar energetic particle event was detected at SOHO, GOES, and STEREO A during the reporting period. At SOHO, the flux of one or more of the >15.8 MeV protons channels exceeded 10^(-1) pfu/MeV starting at 2026-05-25T23:34Z (see notification 20260525-AL-003). At GOES, the flux of > 10 MeV protons exceeded 10 pfu starting at 2026-05-26T00:15Z (see notifications 20260526-AL-001, 20260526-AL-003). At STEREO A, the flux of the 13-100 MeV protons exceeded 10^(-1) pfu/MeV starting at 2026-05-26T04:07Z (see notifications 20260526-AL-004, 20260526-AL-005). This SEP event was associated with the O-type CME first seen in SOHO LASCO C2 at 2026-05-25T22:12Z and was relatively short in duration, ending on 2026-05-26. The integral flux of the > 10 MeV protons at GOES, the flux of one or more of the >15.8 MeV protons channels at SOHO, and the flux of the 13-100 MeV protons detected at STEREO A remained elevated above background levels but below each spacecraft's respective threshold through the end of the reporting period.
Space Weather Impact:
Space weather impacts on NASA spacecraft are expected to have been moderate to high this reporting period due to the solar energetic particle event and elevated energetic electron flux in the Earths outer radiation belt described above.
##Events:
Flares (M-class and above)
Date Start Stop Peak Class Location
2026-05-22 10:03:00 11:01:00 10:29:00 M2.3 N18W96 ( 14436 )
CMEs (>500 km/s):
Earth directed:
NONE
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)
2026-05-20T04:48Z ~789 C NONE(POS)/7 10 SOHO, GOES
2026-05-20T05:12Z ~754 C -173/-31 12 SOHO, STEREO A, GOES
2026-05-20T09:24Z ~522 C 2/46 16 SOHO, STEREO A, GOES
2026-05-20T17:15Z ~661 C 53/16 22 GOES, STEREO A
2026-05-20T19:00Z ~639 C 160/-41 11 GOES, STEREO A
2026-05-22T10:48Z ~594 C 95/35 28 SOHO, STEREO A, GOES
2026-05-23T02:23Z ~624 C -33/5 11 STEREO A, SOHO, GOES
2026-05-23T07:36Z ~580 C NONE(POS)/-24 41 SOHO
2026-05-23T16:00Z ~680 C 83/29 32 SOHO, STEREO A, GOES
2026-05-23T16:36Z ~621 C -134/60 16 SOHO, STEREO A
2026-05-23T17:00Z ~518 C -134/59 21 SOHO, STEREO A
2026-05-23T19:53Z ~847 C -123/63 35 STEREO A, GOES
2026-05-23T20:30Z ~580 C 110/26 28 GOES, SOHO, STEREO A
2026-05-24T09:12Z ~643 C 102/31 31 SOHO, STEREO A, GOES
2026-05-24T11:00Z ~630 C -121/48 18 SOHO, STEREO A, GOES
2026-05-24T16:00Z ~799 C NONE(POS)/24 13 SOHO, GOES
2026-05-25T21:36Z ~556 C -90/50 16 SOHO, GOES
2026-05-25T22:12Z ~1174 O 149/21 37 SOHO, STEREO A, GOES
2026-05-25T23:00Z ~511 C NONE(POS)/52 13 SOHO, GOES
2026-05-25T23:24Z ~1096 O 150/20 38 SOHO, GOES
2026-05-26T00:48Z ~606 C 139/21 29 SOHO, GOES
2026-05-26T02:12Z ~820 C 119/33 24 SOHO, STEREO A, GOES
## Space Weather Outlook:
## Outlook Coverage Begin Date: 2026-05-27T00:00Z
## Outlook Coverage End Date: 2026-06-02T23:59Z
Solar activity is expected to be at low to moderate levels during the outlook period. There are currently 11 numbered Active Regions on the Earth-facing disk.
Geomagnetic activity is expected to be at low to moderate levels during the outlook period. Three coronal holes centered around S25W30, N35W02, and S07E05 (as seen in available imagery from SDO/AIA 193) may reach geoeffective longitudes on or around 2026-05-28 through 2026-05-31, 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
URL: View Details
