NASA StreaM

Faint but fast CME with a dimpled, unclear front seen to the E in SOHO LASCO C2/C3 and GOES CCOR-1 coronagraphs but fully covered by the night-time data gap in STEREO A COR2. The source of it is clearly far-sided, as indicated by a minor but clear movement/opening of field lines seen behind the E limb only in GOES SUVI 195 starting at 2026-05-18T21:05Z.

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - CME (Europa Clipper, OSIRIS-APEX, Missions Near Earth) ## ## Message Issue Date: 2026-05-16T18:38:46Z ## Message ID: 20260516-AL-006 ## ## 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 STEREO A / GOES / SOHO. Start time of the event: 2026-05-16T16:36Z. Estimated speed: ~1201 km/s. Estimated opening half-angle: 22 deg. Direction (lon./lat.): 9/37 in Heliocentric Earth Equatorial coordinates. Activity ID: 2026-05-16T16:36:00-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 this CME may affect Europa Clipper (glancing blow) and OSIRIS-APEX (glancing blow). The flank of the CME will reach Europa Clipper at 2026-05-20T21:00Z and OSIRIS-APEX at 2026-05-19T16:00Z (plus minus 7 hours). The simulation also indicates that the CME may have a glancing blow at NASA missions near Earth. Simulations indicate that the flank of the CME will reach NASA missions near Earth at about 2026-05-19T00:00Z (plus minus 7 hours). The roughly estimated expected range of the maximum Kp index is 3-5 (below minor to minor). Links to the movies of the modeled event (includes CME: 2026-05-16T16:36:00-CME-001): https://iswa.gsfc.nasa.gov/api/redirect?filename=20260516_192700_2.0_anim.tim-den.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260516_192700_2.0_anim.tim-vel.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260516_192700_2.0_ENLIL_CONE_timeline.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260516_192700_2.0_ENLIL_CONE_Osiris_timeline.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260516_192700_2.0_ENLIL_CONE_EuropaClippr_timeline.gif ## Notes: This CME event (2026-05-16T16:36:00-CME-001) is associated with M1.9 flare from AR 14436 (N22W17) with ID 2026-05-16T15:50:00-FLR-001 which peaked at 2026-05-16T16:12Z. 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

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - CME (Parker Solar Probe, STEREO A) ## ## Message Issue Date: 2026-05-02T16:39:43Z ## Message ID: 20260502-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: 2026-05-02T11:24Z. Estimated speed: ~603 km/s. Estimated opening half-angle: 20 deg. Direction (lon./lat.): 92/16 in Heliocentric Earth Equatorial coordinates. Activity ID: 2026-05-02T11:24:00-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 Parker Solar Probe and STEREO A (glancing blow). The leading edge of the CME will reach Parker Solar Probe at 2026-05-04T16:21Z (plus minus 7 hours). The flank of the CME may reach STEREO A at 2026-05-06T00:00Z (plus minus 7 hours). Links to the movies of the modeled event (includes CME: 2026-05-02T11:24:00-CME-001): https://iswa.gsfc.nasa.gov/api/redirect?filename=20260502_171800_2.0_anim.tim-den.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260502_171800_2.0_anim.tim-vel.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260502_171800_2.0_anim.tim-vel-Stereo_A.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260502_171800_2.0_anim.tim-den-Stereo_A.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260502_171800_2.0_ENLIL_CONE_timeline.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260502_171800_2.0_ENLIL_CONE_STA_timeline.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260502_171800_2.0_ENLIL_CONE_PSP_timeline.gif ## Notes: This CME event (2026-05-02T11:24:00-CME-001) is associated with C4.0 flare with ID 2026-05-02T10:44:00-FLR-001 which peaked at 2026-05-02T11:04Z. 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

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - CME (STEREO A, Juice, Parker Solar Probe) ## ## Message Issue Date: 2026-04-25T01:18:32Z ## Message ID: 20260425-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 GOES / SOHO. Start time of the event: 2026-04-24T19:30Z. Estimated speed: ~575 km/s. Estimated opening half-angle: 35 deg. Direction (lon./lat.): 78/37 in Heliocentric Earth Equatorial coordinates. Activity ID: 2026-04-24T19:30:00-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 STEREO A (minor impact), Juice (glancing blow), and Parker Solar Probe (glancing blow). The flank of the CME will reach STEREO A at 2026-04-27T12:00Z, Juice at 2026-04-29T04:00Z, and Parker Solar Probe at 2026-04-26T12:00Z (plus minus 7 hours). Links to the movies of the modeled event (includes CME: 2026-04-24T19:30:00-CME-001): https://iswa.gsfc.nasa.gov/api/redirect?filename=20260425_014600_2.0_anim.tim-den.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260425_014600_2.0_anim.tim-vel.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260425_014600_2.0_anim.tim-vel-Stereo_A.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260425_014600_2.0_anim.tim-den-Stereo_A.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260425_014600_2.0_ENLIL_CONE_timeline.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260425_014600_2.0_ENLIL_CONE_STA_timeline.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260425_014600_2.0_ENLIL_CONE_PSP_timeline.gif https://iswa.gsfc.nasa.gov/api/redirect?filename=20260425_014600_2.0_ENLIL_CONE_Juice_timeline.gif ## Notes: This CME event (2026-04-24T19:30:00-CME-001) is associated with M6.4 flare from Active Region 14419 (N15W78) with ID 2026-04-24T17:54:00-FLR-001 which peaked at 2026-04-24T18:15Z (see notifications 20260424-AL-008 and 20260424-AL-009). 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

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - CME (Europa Clipper, OSIRIS-APEX, STEREO A, Missions Near Earth) ## ## Message Issue Date: 2026-04-16T19:38:00Z ## Message ID: 20260416-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: 2026-04-16T09:00Z. Estimated speed: ~677 km/s. Estimated opening half-angle: 16 deg. Direction (lon./lat.): 22/-9 in Heliocentric Earth Equatorial coordinates. Activity ID: 2026-04-16T09:00:00-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 this CME may affect Europa Clipper (glancing blow), OSIRIS-APEX (glancing blow), and STEREO A (glancing blow). The flank of the CME will reach Europa Clipper at 2026-04-21T06:00Z, OSIRIS-APEX at 2026-04-19T04:00Z, and STEREO A at 2026-04-19T05:00Z (plus minus 7 hours). The simulation also indicates that the CME may have a glancing blow at NASA missions near Earth. Simulations indicate that the flank of the CME will reach NASA missions near Earth at about 2026-04-18T14:00Z (plus minus 7 hours). The roughly estimated expected range of the maximum Kp index is 3-5 (below minor to minor). Links to the movies of the modeled event (includes CME: 2026-04-16T09:00:00-CME-001): https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260416_131300_2.0_anim.tim-den.gif https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260416_131300_2.0_anim.tim-vel.gif https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260416_131300_2.0_anim.tim-vel-Stereo_A.gif https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260416_131300_2.0_anim.tim-den-Stereo_A.gif https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260416_131300_2.0_ENLIL_CONE_timeline.gif https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260416_131300_2.0_ENLIL_CONE_STA_timeline.gif https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260416_131300_2.0_ENLIL_CONE_Osiris_timeline.gif https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260416_131300_2.0_ENLIL_CONE_EuropaClippr_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

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - CME update (OSIRIS-APEX, Missions Near Earth) ## ## Message Issue Date: 2026-04-03T00:28:41Z ## Message ID: 20260403-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: Update on CME with ID 2026-04-02T20:46:00-CME-001 (see previous notification 20260402-AL-006). Based on updated 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 this CME may affect OSIRIS-APEX (glancing blow). The flank of the CME may reach OSIRIS-APEX at 2026-04-05T21:00Z (plus minus 7 hours). The simulation also indicates that the CME may have a glancing blow at NASA missions near Earth. Simulations indicate that the southern flank of the CME may reach NASA missions near Earth at about 2026-04-05T20:00Z (plus minus 7 hours). The roughly estimated expected range of the maximum Kp index is 3-4 (below minor). Updated CME parameters are: Start time of the event: 2026-04-02T20:46Z. Estimated speed: ~832 km/s. Estimated opening half-angle: 16 deg. Direction (lon./lat.): 15/20 in Heliocentric Earth Equatorial coordinates. Activity ID: 2026-04-02T20:46:00-CME-001 Links to the movies of the modeled event (includes CME: 2026-04-02T20:46:00-CME-001): https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260402_235300_2.0_anim.tim-den.gif https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260402_235300_2.0_anim.tim-vel.gif https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260402_235300_2.0_ENLIL_CONE_timeline.gif https://iswa.ccmc.gsfc.nasa.gov/api/redirect?filename=20260402_235300_2.0_ENLIL_CONE_Osiris_timeline.gif ## Notes: This CME event (2026-04-02T18:48:00-CME-001) is associated with M3.5 flare from Active Region 14044 (N12W18) with ID 2026-04-02T17:23:00-FLR-001 which peaked at 2026-04-02T18:15Z. 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