CCMC CME Scoreboard

Prediction for CME (2026-06-03T07:23:00-CME-001)

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# DAILY BULLETIN ON SOLAR AND GEOMAGNETIC ACTIVITY from the SIDC     #
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SIDC URSIGRAM 60604
SIDC SOLAR BULLETIN 04 Jun 2026, 1235UT
SIDC FORECAST
SOLAR FLARES  : M-class flares expected (probability >=50%)
GEOMAGNETISM  : Major (ISES: Severe) magstorm expected (A>=100 or K>=7)
SOLAR PROTONS : Quiet
PREDICTIONS FOR 04 Jun 2026  10CM FLUX: 148 / AP: 024
PREDICTIONS FOR 05 Jun 2026  10CM FLUX: 150 / AP: 123
PREDICTIONS FOR 06 Jun 2026  10CM FLUX: 150 / AP: 035

Solar Active Regions and flaring: Solar flaring activity was low over the
past 24 hours. There are currently 8 numbered regions on the disk. The
largest flare was a C5.1 flare (SIDC Flare 7848) peaking on June 03 at
23:43 UTC, which was produced by SIDC Sunspot Group 887 (NOAA Active Region
4459). Sunspot Groups 886 and 887 (NOAA Active Region 4458 and 4459)
continued to grow over the period and have magnetic type beta. Sunspot
Group 860 (NOAA Active Region 4455) simplified slightly but remains the
most complex region on the disk. Sunspot group 853 (NOAA Active Region
4444) has now rotated over the west limb and SIDC Sunspot group 873 and 888
(NOAA Active Regions 4460 and 4446) will rotate over the limb over the next
hours. The remaining regions are simple and mostly quiet. Solar flaring
activity is expected to be moderate over the next 24 hours, with C-class
flares expected and M-class flares probable with a chance for X-class
flares.

Coronal mass ejections: Multiple Coronal Mass Ejections (CMEs) reported
yesterday are predicted to impact Earth. The eruptions on June 02, related
to the on disk dimmings associated with the M1.2 and M3.3 flares (SIDC
Flares 7825 and 7826), were not associated with clear CME signatures in the
coronagraph data possibly due to the simultaneous CMEs near the limb.
However, any CMEs associated with these events are expected to be caught by
the following eruptions from June 03.
Three CMEs were detected on June 03 with Earth directed components:
Firstly, a halo CME, associated with the M9.3 flare (SIDC flare 7838), seen
in SOHO LASCO-C2 and seen STEREO-A COR2 starting at June 03 at 01:53 UTC.
Secondly, a partial halo CME (directed to the north-west), detected in SOHO
LASCO-C2 from 07:58 UTC on June 03, associated with the M7.7 flare (SIDC
flare 7840). Thirdly, a partial halo CME (directed to the north-west),
detected in SOHO LASCO-C2 from 11:48 UTC on June 03, associated with the
X1.0 flare (SIDC flare 7842).  These CMEs are expected to impact Earth from
late on June 04 and through June 05.

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