Vector magnetic field changes associated with X-class flares

Details Vector magnetic field changes associated with X-class flares Vector magnetic field changes associated with X-class flares

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424..436w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 1, p. 436-443

Astronomy and Astrophysics

Astrophysics

113

Magnetic Fields, Shearing, Solar Flares, Magnetic Signatures, Photosphere

Scientific paper

We present high-resolution transverse and longitudinal magnetic field measurements bracketing five X-class solar flares. We show that the magnetic shear, defined as the angular difference between the measured field and calculated potential field, actually increases after all of these flares. In each case, the shear is shown to increase along a substantial portion of the magnetic neutral line. For two of the cases, we have excellent time resolution, on the order of several minutes, and we demonstrate that the shear increase is impulsive. We briefly discuss the theoretical implications of our results.

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