Presto Alert - [Aurora Alert]

Issued: 2020 Dec 01 1612 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 C1 flare peaking at 7:21UT originating from NOAA AR 2787 was associated with a dimming and EUV wave and an associated CME visible in SoHO/LASCO from 7:12UT.
While the core of the CME is clearly not directed directly Earthward, a shock signature can be seen expanding over the South and there are also faint signatures over the North. Hence the CME could potentially be claimed to be classified as partial Halo.
From STEREO A perspective, the CME looks like an asymmetric halo. In conclusion the direction is estimated to be more towards STEREO A, estimated at -45 degrees longitude and 25 degrees latitude. A glancing blow at Earth from this CME is quite possible.
The projected speed is around 650 km/s both in LASCO and STEREO and we estimate a speed of around 1000km/s along the direction of propagation. Estimates currently
indicate a possible glancing blow at Earth in the morning of December 4 (6:00 UT).
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# Solar Influences Data analysis Center – RWC Belgium #
# Royal Observatory of Belgium #
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