I'm not too keen on the "exciting" events like today's X4.9 blast, but it sure is a pretty sight. Here's an image taken by SDO with the 1600A filter at 00:45 UTC on 25 Feb 2014:
|An X4.9 boomer at 00:45 UTC|
The width of that outer loop is about 37,400km (three Earth diameters). Do you feel small yet?
I also like the fact that this event was so bright that it caused internal reflections in the optics.
An hour later, this region is still "glowing":
|Same region at 01:45 UTC|