Solar alert

Issued on 2023 May 10 0744 UTC

A shock was observed in the solar wind at 22:07 UTC on May 09. This could be associated with the CME observed on May 07. The total magnetic field increased from 6 to 14nT and the solar wind speed jumped from 450 to 525 km/s. the solar wind speed then reach a maximum value of 676 km/s at 23:53 UT. This produced minor geomagnetic storms globally (NOAA Kp=5+) and locally (K Bel =5). The solar wind conditions are expected to remain enhanced over the next day due to the passage of the CME. The arrival of the ICME also produced an increase of the proton flux from 22:20 UTC, which had been decreasing, and is now once again above the 10pfu threshold since 23:40 UTC May 09.

Issued on 2023 May 10 1020 UTC

A partial halo coronal mass ejection (CME) was first observed in the LASCO/C2 chronograph imagery around 19:00 UTC on May 09. The CME was associated with an M4.2 flare from NOAA AR 3296, with peak time 18:58 UTC. The majority of the CME is directed to the north west, but a full halo shock is visible. A preliminary analysis suggests an estimated arrival at Earth on May 11, a full analysis is ongoing.

Reference for this alert

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