Presto Alert - [Aurora Alert]

Issued: 2020 Nov 30 0942 UTC
:Product: documentation at www.sidc.be/products/presto
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# FAST WARNING ‘PRESTO’ MESSAGE from the SIDC (RWC-Belgium) #
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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.
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# Solar Influences Data analysis Center – RWC Belgium #
# Royal Observatory of Belgium #
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