Rapid Evolution of Magnetic Fields Associated with Flares and CMEs

Details Rapid Evolution of Magnetic Fields Associated with Flares and CMEs Rapid Evolution of Magnetic Fields Associated with Flares and CMEs

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.2303w&link_type=abstract

American Astronomical Society, SPD meeting #34, #23.03; Bulletin of the American Astronomical Society, Vol. 35, p.852

Astronomy and Astrophysics

Astronomy

Scientific paper

Recent BBSO and MDI magnetograph observations demonstrate more and more evidences of rapid changes of photospheric magnetic fields associated with the core regions of flares and CMEs. The signatures of such changes include (1) sudden imbalanced flux increase; (2) sudden formation of new penumbra; (3) sudden sunspot disappearances; (4) rapid increases of transverse field strength and magnetic shear; (5) sudden expansion of sunspots. The time scales of the changes are from 10 minutes to one hour, and the changes are permanent. We explain the observations by the following possible models of flare/CME triggering: (1) rapid magnetic reconnection and subsequent submergence; (2) emergence of twisted and inclined flux tubes and (3) impulsive emergence and detachment of magnetic ``bubbles" or U-shaped ropes.

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