Solar alert

Issued on 2023 May 06 1027 UTC

A solar wind shock as observed today on May 06 at 00:25 UTC. The solar wind speed jumped from 331 km/s to 375 km/s, the total interplanetary magnetic field jumped from 4 nT to 8 nT, then rapidly increased to reach 16 nT. The southward interplanetary magnetic field jumped from -2 nT to 5 nT, then rapidly reach close to -16 nT. Finally, the solar wind density also jumped from 4.2 to 15.6 [cm-3].

This solar wind shock was immediately followed by a geomagnetic storm (Kp-Potsdam = 6, Kp-NOAA = 5-, and K-Bel=5).

The origin of this solar wind shock is under analysis, a possible candidate could be the coronal mass ejection observed on May 04 associated to the M3.9-class flare peaking at 08:44 UTC that was North-East directed and was determined to be a near miss. However, further investigated would be needed.

Issued on 2023 May 06 1328 UTC

The partial halo coronal mass ejections (CME) was observed in the morning of May 05, first time seen in the SOHO/LASCO C2 field of view at 07:48 UTC. The partial halo was the result of two CMEs, associated with the C9.5-class flare (from NOAA Active Region 3297 on May 05, peaking at 07:06 UTC) and the M2.1-class flare (from NOAA Active Region 3296 on May 05, peaking at 08:01 UTC). Those two CMEs show an Earth directed component and are expected to arrive on May 07 at the end of the day.

Reference for this alert

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