Sunday, January 22, 2012

CME and Sunspot update

   Regions 1408 and 1409 were numbered in the night, both are small and simple. The largest regions on the visible disc 1401 and 1402 both simplified during the last 24 hours. Both regions saw spot decay in the trailing part of the groups. Region 1401 decreased in size while region 1402 increased in size slightly.
Region 11401 [N17W13] lost penumbral area and gained spots in the trailing spot section while the leading penumbra split into two. If the current separation between the leading and trailing spot section increases the region could be split. M class flares are possible.
Region 11402 [N30W08] remains capable of producing further M class flares. The large penumbra has taken on a symmetrical shape

   We had a C7 solar flare peaking at 02:57 UTC and right after that  followed by a C3 flare at 04:00 UTC, both from  region 1401. We have to remember during the declining phase of large sunspot groups, solar flares can take place as spots disappear and opposing magnetic fields collapse on to each other. A large recurrent coronal hole (CH496) in the southern hemisphere could rotate into an Earth facing position on January 24-26. (CH497) is now in  a Earth facing position.

   We have a backside CME that occured around 14:00 UTC as we can see here on STEREO A. This CME is not Earth facing. Also, the unstable filament in the northwest region of the solar disk has snapped and lifted off. This is not expected to be Earth facing.
     Have a look on this latest video and the new CME. However main EVENT is still the arriving of the CME from Jan19.


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