Solar alert

Issued on 2023 Jul 14 1022 UTC

A faint full halo coronal mass ejection (CME) was first observed in LASCO/C2 coronagraph data at 06:24UTC on July 13th. The CME is bask-sided and no impact on Earth is expected. Another faint and slow westward partial halo CME was observed to lift off the solar surface at 13:48 UTC on July 13th. The CME seems related to a filament eruption near the north-west limb. Preliminary analysis based on the source location suggests that the CME will not impact Earth.

Issued on 2023 Jul 14 1728 UTC

A fast forward shock was observed in the solar wind parameters at 15:25 UTC on July 14th. The solar wind velocity increased from 386 km/s to 480 km/s. The interplanetary magnetic field jumped from 8 nT to 14 nT. The solar wind density jumped from 9 ppc to 16 ppc. The current density is at 32 ppc, while velocity is 443 km/s and both continue increasing. The shock possibly marks an expected glancing blow from the southward partial halo CME which lifted off the solar surface around 19:24 UTC on July 11th following an earlier filament eruption near NOAA 3363. The ICME arrival is expected to result in minor geomagnetic storms with possibility of reaching moderate storm levels. A high speed stream arrival from a negative polarity coronal hole is also expected within the next 24 hours and its signatures could be mixed within the ongoing glancing blow.

Reference for this alert

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