August 24, 2021
In a few days a CME from a large filament from the Sun will make a direct hit on the Earth August 25-26, 2021.
EARTH’S MAGNETIC FIELD IS ABOUT TO BE UPSET: A solar wind stream and, possibly, two CMEs are approaching Earth. A direct hit by the stream on Aug. 25th followed by near-misses (or glancing blows) from the CMEs on Aug. 26th could spark 2 to 3 days of polar geomagnetic unrest. That’s exciting because the Arctic Circle is getting dark enough for auroras.
The CME, first observed at 06:36 UT this morning was associated with a large filament eruption (stretching from about 30 degrees North to 30 degrees South). The few available images indicate that the angular width of the associated CME was about 90 degrees and velocity was about 500 km/s. We will report more on this CME when data become available. Yesterday we have reported about the CME, associated with the eruption of a large filament (situated close to the extension of the northern polar coronal hole) observed around midnight of August 22. The newly available data show that the angular width of the CME was about 180 degrees and projected line of the sight speed was about 450 km/s. We expect arrival of this CME at Earth in the afternoon of August 26.