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).

Reference for this alert

All Presto solar alerts