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Issued on 2020 Dec 01 1612 UTC
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).