Flux emergence and umbra formation after the X-9 flare of 1991 March 22

Details Flux emergence and umbra formation after the X-9 flare of 1991 March 22 Flux emergence and umbra formation after the X-9 flare of 1991 March 22

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407l..89w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 407, no. 2, p. L89, L90.

Astronomy and Astrophysics

Astrophysics

30

Magnetic Field Configurations, Magnetic Field Reconnection, Solar Flares, Solar Magnetic Field, Umbras, Magnetic Flux, Magnetic Signatures

Scientific paper

Vector magnetograms, H-alpha, D3, and white-light filtergrams were obtained at the Big Bear Solar Observatory immediately after the X-9 flare on March 22, 1991. These observations show that the umbral area increased by 2 x 10 exp 7 sq km, together with a magnetic flux increase of 2 x 10 exp 20 Mx. The magnetic shear increased by 40 deg along the neutral line. It is indicated, by the study of the evolution of spot and magnetic structure of the March 22, 1991 region, that a pair of new umbrae emerged suddenly on either side of the neutral line coinciding with the shear increase immediately after the flare.

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