Magnetic Flux Change And Cancellation Associated With X- And M-class Flares

Details Magnetic Flux Change And Cancellation Associated With X- And M-class Flares Magnetic Flux Change And Cancellation Associated With X- And M-class Flares

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2215b&link_type=abstract

American Astronomical Society, SPD meeting #42, #22.15; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Recently it has become clear that photospheric magnetic fields change
significantly, abruptly and permanently as a result of major X- and M-class flares. We perform a statistical study of permanent changes in longitudinal fields associated with solar flares by tracking magnetic features. The YAFTA feature tracking algorithm is applied to GONG++ one-minute magnetograms for 77 X- and M-class flares to analyze the evolution and interaction of the magnetic features and to estimate the amount of cancelled flux. We find that about twice as many magnetic flux decreases as increases occurred during the flares, consistent with collapsing loop structure. The flux changes were accompanied in most cases by significant cancellation, most of which occurred before and during the flares.

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