Observations of vector magnetic fields in flaring active regions

Details Observations of vector magnetic fields in flaring active regions Observations of vector magnetic fields in flaring active regions

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..154..261c&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 154, no. 2, p. 261-273

Mathematics

59

Magnetic Signatures, Solar Flares, Solar Magnetic Field, Vectors (Mathematics), Magnetic Field Configurations, Photosphere, S Waves

Scientific paper

We present vector magnetograph data of 6 active regions, all of which produced major flares. Of the 20 M-class (or above) flares, 7 satisfy the flare conditions prescribed by Hagyard (high shear and strong transverse fields). Strong photospheric shear, however, is not necessarily a condition for a flare. We find an increase in the shear for two flares, a 6-deg shear increase along the neutral line after a X-2 flare and a 13-deg increase after a M-1.9 flare. For other flares, we did not detect substantial shear changes.

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