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Sudden Photospheric Motion and Sunspot Rotation Associated with the X2.2 Flare on 2011 February 15  

Shuo Wang   Submitted: 2014-01-30 19:56

The Helioseismic and Magnetic Imager provides 45 s cadence intensity images and 720 s cadence vector magnetograms. These unprecedented high-cadence and high-resolution data give us a unique opportunity to study the change of photospheric flows and sunspot rotations associated with flares. By using the differential affine velocity estimator method and the Fourier local correlation tracking method separately, we calculate velocity and vorticity of photospheric flows in the flaring NOAA AR 11158, and investigate their temporal evolution around the X2.2 flare on 2011 February 15. It is found that the shear flow around the flaring magnetic polarity inversion line exhibits a sudden decrease, and both of the two main sunspots undergo a sudden change in rotational motion during the impulsive phase of the flare. These results are discussed in the context of the Lorentz-force change that was proposed by Hudson et al. (2008) and Fisher et al. (2012). This mechanism can explain the connections between the rapid and irreversible photospheric vector magnetic field change and the observed short-term motions associated with the flare. In particular, the torque provided by the horizontal Lorentz force change agrees with what is required for the measured angular acceleration.

Authors: Shuo Wang, Chang Liu, Na Deng, Haimin Wang
Projects: SDO-HMI

Publication Status: ApJL accepted
Last Modified: 2014-01-31 06:38
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Response of the Photospheric Magnetic Field to the X2.2 Flare on 2011 February 15  

Shuo Wang   Submitted: 2011-12-16 12:43

This abstract was corrupted following database problems and is being recovered. It will be restored as quickly as possible. Any questions, please send them to Alisdair. Sorry for any incovenience.


Authors: Shuo Wang, Chang Liu, Rui Liu, Na Deng, Yang Liu, and Haimin Wang
Projects: Hinode/SOT,RHESSI,SDO-AIA,SDO-HMI

Publication Status: ApJ Letters, accepted
Last Modified: 2011-12-19 09:06
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Sudden Photospheric Motion and Sunspot Rotation Associated with the X2.2 Flare on 2011 February 15
Response of the Photospheric Magnetic Field to the X2.2 Flare on 2011 February 15

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