Long duration C-class flare with full halo CME

[Ulrich Rieth]

Hi all!

Heads up for a possible auroral display on thursday June 23rd 2011.
Today (2011/06/21) a long duration C-class flare was observed on the sun.
It originated in active region 11236 almost at the center of the solar disc.
This flare triggered a filament eruption nearby which lead to the full halo CME.
The solar plamsa was clocked with a plane of sky speed of 800 km/s and in the STEREO image with a speed in the ecliptic plane of about 1000 km/s.
It will be a nearly head on collision which might give us some periods of major geomagnetic and auroral storming.
Impact is expected late on June 23rd plus or minus some hours.
Updates on the known spaceweather sites will follow, but I am not able to post them here until afternoon on 23rd.
Clear skies!

 Ulrich