Report
3 Jun 2026, 21:10 GMT
Topic: space_weather
## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information (CCMC DONKI) ## Message Type: Weekly Space Weather Summary Report for May 27, 2026 - June 02, 2026 ## ## Message Issue Date: 2026-06-03T21:10:26Z ## Report Coverage Begin Date: 2026-05-27T00:00Z ## Report Coverage End Date: 2026-06-02T23:59Z ## Message ID: 20260603-7D-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 4 M-class flares, 1 O-type CME, and 16 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) ----------------------------------------------------------------------------- 2026-05-30T01:38Z NASA missions near Earth at at 2026-06-02T19:00Z (glancing blow), Kp index 2-3 (below minor) (see notification 20260530-AL-002). Analysis is ongoing to determine if the arrival of this CME was observed at L1 on 2026-06-03. 2026-06-02T17:23Z NASA missions near Earth at at 2026-06-05T08:00Z (minor impact), Kp index 3-5 (below minor to minor) (see notification 20260602-AL-003). It was also estimated that the following CMEs were predicted to impact the listed locations: CME Starting time | Predicted Impacts (plus minus 7 hours) ----------------------------------------------------------------------------- 2026-05-30T08:38Z Solar Orbiter at 2026-06-01T05:11Z, BepiColombo at 2026-05-31T14:00Z (glancing blow), Juno at 2026-06-13T12:00Z (glancing blow) (see notification 20260530-AL-001). 2026-05-31T23:36Z Solar Orbiter at 2026-06-02T18:47Z, BepiColombo at 2026-06-02T00:00Z (glancing blow), Juno at 2026-06-12T18:00Z (minor impact) (see notification 20260601-AL-001). 2026-06-01T19:00Z Mars at 2026-06-05T12:00Z (glancing blow), Psyche at 2026-06-05T12:00Z (glancing blow) (see notification 20260602-AL-001). 2026-06-01T19:09Z Mars at 2026-06-05T12:00Z (glancing blow), Psyche at 2026-06-05T12:00Z (glancing blow) (see notification 20260602-AL-001). 2026-06-02T17:00Z BepiColombo at 2026-06-03T12:00Z (glancing blow), Solar Orbiter at 2026-06-04T16:00Z (glancing blow), Juno at 2026-06-15T12:00Z (minor impact) (see notification 20260602-AL-002). 2026-06-02T17:23Z Europa Clipper at 2026-06-07T02:00Z (minor impact), OSIRIS-APEX at 2026-06-06T06:00Z (minor impact), Juice at 2026-06-07T18:00Z (glancing blow) (see notification 20260602-AL-003). Geomagnetic activity was at below minor levels with Kp index (a measure of geomagnetic activity, ranging 0-9) 2.0 MeV energetic electron flux detected at GOES remained below the threshold level of 1000 pfu for the entire reporting period. 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 were above background levels at the beginning of the reporting period but below each spacecraft's respective threshold due to the O-type CME first seen in SOHO LASCO C2 at 2026-05-25T22:12Z. These fluxes subsided to near-background levels by the end of 2026-05-28. Later in the reporting period, the flux of 13-100 MeV protons detected at STEREO A increased above background levels but remained below the threshold of 10^-1 pfu/MeV on 2026-05-30. This relative increase is likely associated with the C-Type CME first seen in STEREO A COR2 at 2026-05-30T08:38Z. The energetic proton fluxes at STEREO A returned to background levels later on 2026-05-30 and remained at background levels alongside other observed fluxes through the end of the reporting period. Space Weather Impact: Space weather impacts on NASA spacecraft are expected to have been low to minor this reporting period due to the slightly elevated solar energetic particle fluxes described above. ##Events: Flares (M-class and above) Date Start Stop Peak Class Location 2026-05-29 06:40:00 07:24:00 07:04:00 M1.1 N14E62 ( 14455 ) 2026-06-02 04:42:00 04:47:00 04:45:00 M1.2 S25E80 ( 14461 ) 2026-06-02 09:51:00 10:19:00 10:05:00 M1.2 N11E01 ( 14455 ) 2026-06-02 16:31:00 16:56:00 16:50:00 M3.3 N13W05 ( 14455 ) 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) 2026-05-30T01:38Z ~503 C -30/-1 10 STEREO A, SOHO, GOES 2026-06-02T17:23Z ~672 C 5/9 14 STEREO A 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) 2026-05-27T01:38Z ~532 C NONE(POS)/-32 17 STEREO A 2026-05-27T02:24Z ~521 C -90/43 17 SOHO 2026-05-29T18:00Z ~521 C -1/65 24 SOHO, STEREO A 2026-05-30T08:38Z ~776 C -168/23 51 STEREO A, SOHO, GOES 2026-05-30T19:00Z ~551 C NONE(POS)/-63 10 SOHO, GOES 2026-05-31T18:00Z ~519 C 110/15 10 SOHO, STEREO A, GOES 2026-05-31T23:36Z ~889 C -148/30 42 SOHO, STEREO A, GOES 2026-06-01T09:24Z ~608 C NONE(POS)/-29 10 SOHO, GOES 2026-06-01T10:36Z ~881 C NONE(POS)/-23 10 SOHO, GOES 2026-06-01T19:00Z ~519 C 120/-39 33 SOHO, STEREO A, GOES 2026-06-01T19:09Z ~1031 O 127/-26 17 STEREO A, SOHO, GOES 2026-06-01T23:00Z ~836 C NONE(POS)/-14 10 SOHO, GOES 2026-06-02T03:12Z ~612 C -15/60 13 SOHO, STEREO A 2026-06-02T07:24Z ~801 C -3/55 16 SOHO, STEREO A 2026-06-02T17:00Z ~866 C -121/26 36 SOHO, STEREO A, GOES ## Space Weather Outlook: ## Outlook Coverage Begin Date: 2026-06-03T00:00Z ## Outlook Coverage End Date: 2026-06-09T23:59Z Solar activity may vary between moderate and high levels during the outlook period. There are currently eight numbered Active Regions on the Earth-facing disk. Active Region 14455 (N13W16) produced three M-class flares during the reporting period and has produced two M-class flares and one X-class flare during the outlook period (see notifications 20260603-AL-001, 20260603-AL-002, 20260603-AL-005, 20260603-AL-006, 20260603-AL-007, 20260603-AL-008). This active region may continue to exhibit flaring activity through the outlook period. Geomagnetic activity is expected to vary between low and moderate or severe levels during the outlook period. Potential increases in geomagnetic activity may be associated with the anticipated combined arrival of the three O-Type CMEs first observed in STEREO A COR2 at 2026-06-03T01:53Z, in STEREO A COR2 at 2026-06-03T07:23Z, and in SOHO LASCO C2 at 2026-06-03T11:48Z. These CMEs are predicted to impact missions near Earth around 2026-06-04T23:44Z (+- 7 hours) (see notification 20260603-AL-013). Additionally, a coronal hole centered around (N00W42) (as seen in available imagery from SDO/AIA 193) may reach geoeffective longitudes on or around 2026-06-03 and also be a source of increased geomagnetic activity 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