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Issued on 2023 May 08 1022 UTC
A full halo coronal mass ejection (CME) was first observed in the LASCO/C2 chronograph imagery around 23:25 UTC on May 07. The CME was driven by a long-duration M1 flare from NOAA AR 3296 (beta), peak time 22:34 UTC, located near the central meridian close to the disc centre. The initial estimated plane of sky velocity of the CME is around 600 km/s and preliminary analysis suggests an estimated arrival at Earth on May 11, a full analysis is ongoing.
Issued on 2023 May 08 1418 UTC
A proton event was observed passing the 10pfu threshold from 12:57 UTC May 08. The proton flux was gradually increasing from 01:25 UTC, likely associated with the long duration M1 flare at 23:23 UTC May 07 and the associated halo CME. The proton flux at STEREO-A is also elevated, showing a sharper rise from 00:00 UT May 08. The proton flux is expected to remain elevated over the next days.
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