Sunspot Rotation and the M-class Flare in Solar Active Region NOAA 11158
نویسندگان
چکیده
In this paper, we measure the rotation of a sunspot in solar active region NOAA 11158 (Solar Target Identifier SOL2011-02-15) that was associated with an M-class flare. The flare occurred when the rotation rate of the sunspot reached its maximum. We further calculate the energy in the corona produced by the sunspot rotation. The energy accumulated in the corona before the flare reached 5.5× 10 erg, sufficient for energy requirements for a moderately big solar eruption. This suggests that sunspot rotation, which is often observed in solar active regions, is an effective mechanism for building up magnetic energy in the corona.
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