Solar Disk Activity in January of 2012
This is a full disk monochrome shot taken on Jan 12, 2013 in New Mexico that I just got around to processing. I used a Lunt LS80mm HA DSII scope and a DMK41 camera. I also used a 0.8x FR to capture the entire disk. This is the combination of the best 20% stack of 879 frames using AutoStakke! 2.0 and then processed in Photoshop CS6 (sharpened with AstraImages 3.0 plug-in). North is up in this image. This was a particularly active solar day although most of the activity was within the disk proper and not on the edges (alas, no big prominences). I was able to catch several cool features including the very active sunspot AR11654 (middle left) which was flaring at this time, a number of prominent filaments (dark streaks which are actually prominences seen head-on), and an unusual (at least to me) filaprom in the lower right hand quadrant. The latter appears to be a series of small prominences starting from the SW rim and lining up in snake-like fashion across the lower right portion of the disk. I have since found out that this phenomenon is called a "polar crown" which is a curved wall of plasma 100's of thousands of km long. It is a magnetic field phenomenon and is fairly rare. It is also easier to see from an angle such as a spacecraft could provide. A brief description as well as a short video taken by a Japanese spacecraft in 2008 can be seen at http://science.nasa....ep_polarcrown/.
Image META information
|IPTC.Caption||IDL TIFF file|