Issued on 2020 Nov 30 0942 UTC

The M4 flare peaking at 13:11UT December 29, originating from an unnumbered region at

the East limb, was associated with a type II radio burst and EUV wave.

In SoHO/LASCO C2 a corresponding CME is visible from around 13:25UT (the true time of

emergence in C2 view must be in the data gap between 12:48UT and 13:25UT). The CME is

directed well toward to the East of the Sun-Earth line with a projected speed of

around 1500 km/s. While the bulk is directed off the Sun-Earth line the associated

shock wave leaves an asymmetric full halo signature in SoHO/LASCO C2 and C3

imagery.

The bulk of the CME is hence not expected to arrive to Earth but a glancing blow and

arrival of the shock wave is quite possible. That is expected late December 1 or

early December 2.

Reference for this alert

All Presto solar alerts