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.

NOAA AR 11158 emerged on the solar surface on February, 2011. It produced a lot of flares including X-class one. Hinode and SDO observed this region in detail from its emergence. Spectro-polarimetric data on the photosphere was obtained by Solar Optical Telescope (SOT) on board Hinode in the vicinity of M6.6 flare.

We report the evolution of the magnetic field in NOAA AR11158 over 5 days (2011 Feb 12-16) using preliminary vector magnetograms from the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamic Observatory (SDO). This region consisted of two pairs of major sunspots and displayed a complex quadrupolar field topology.

2013年2月7日 · Combining this with observations of flare ribbons in the 1600Å channel of the \emph {Atmospheric Imaging Assembly} (AIA) onboard SDO, we propose a minimization algorithm for estimating the amount of reconnected flux and resulting drop in …

2012年8月21日 · We compare horizontal flow fields in the photosphere and in the subphotosphere (a layer 0.5 megameters below the photosphere) in two solar active regions: AR11084 and AR11158. AR11084 is a mature, simple active region without significant flaring activity, and AR11158 is a multipolar, complex active …

2013年6月10日 · Combining this with observations of flare ribbons in the 1600 A channel of the Atmospheric Imaging Assembly on board SDO, we propose a minimization algorithm for estimating the amount of reconnected flux and resulting drop in magnetic free energy during a flare. For the M6.6, M2.2, and X2.2 flares, we find a flux exchange of 4.2 more »

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