Solar alert

Issued on 2024 Feb 11 1246 UTC

A solar wind shock was detected at 01:20 UTC on Feb 11th, possibly related to an early ICME arrival of the expected Feb 8th CME. The solar wind speed jumped from 355 km/s to 440 km/s. The magnitude of the interplanetary magnetic field quickly increased from 4 nT to 16 nT and soon after reached a maximum of 19 nT. The solar wind velocity has since increased to about 580 km/s. The solar wind conditions are expected to be remain perturbed throughout Feb 11th. Further enhancements in the solar wind parameters are expected late on Feb 12th and Feb 13th due to the anticipated arrival of two other ICMEs.

Issued on 2024 Feb 11 1316 UTC

A fast partial halo CME was detected in the LASCO/C2 imagery around 23:36 UTC on Feb 10th. A huge coronal dimming near the disc center is visible in the SDO/AIA running difference images. The CME is related to an impulsive M9-flare from NOAA AR 3576, which triggered a chain of nearby filament eruptions. It has an estimated velocity above 900 km/s and is expected to have a substantial Earth-directed component with predicted arrival time early on Feb 13th. The CME might catch up and mix with the other CME predicted to arrive late on Feb 12 to early Feb 13th, which could result in a possible earlier arrival. Moderate to major geomagnetic storm levels are expected to be reached related to the ICME arrivals.

Reference for this alert

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