AR11158

This region emerged in two spatially distinct yet cotemporal sites: one leading and slightly equatorward of the other, beginning early on February 11th. It also emerged, broadly, in two phases, the second phase following the first by a couple days. During this 4 day timeframe, AR11158 produced 18 flares with GOES class greater than C1.0, including three flares (M6.6, M2.2, and X2.2) greater than M1.0

The Magnetogram
My 2011 REU student, Meg Millhouse (Reed College), did the data preparation for this region, starting shortly after initial emergence, and ending a few hours after the fantastic X2.2 Valentine's Day flare (which actually took place at 2012-02-15 01:44 UT). Here's an avi movie of the LOS HMI magnetograms, taken from the 720 second averaged dataseries. Cadence is 24 minutes (half cadence of the full dataseries).
For interested parties, the data series containing the magnetogram and mask structure is available here as an IDL .sav file.

This image shows the different flux emergence cycles, divided into Northern and Southern emergence regions, as well as a external regions of concentrated network flux: AR11158 North-South flux imbalance

Various AIA 1600 movies:
Following are javascript movies of AIA 1600 Angstrom images during the 2 M and 1 X class flares produced by this region. The flare ribbons demarcate various subregions involved in each flare...basically, not every magnetic domain relaxes in every flare.

Feb 13, 13:44. Overlaid are contours of the HMI LOS magnetic field, and potential field topology: C4.7 flare:

Same, during the Feb 13, 17:28 M6.6 flare:

Just the 1600 angstrom data, during the Feb 14, 17:20 M2.2 flare:
The M2.2 flare is eruptive: it spews a bunch of mass out of the active region, and you can even see that in the 1600 images.

Same, during the Feb 15, 01:44 X2.2 flare: