Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364l..49d&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 364, Dec. 1, 1990, p. L49-L52.
Astronomy and Astrophysics
Astrophysics
9
Emission Spectra, Magnesium, Solar Flares, Field Strength, Infrared Spectra, Solar Magnetic Field, Solar Spectra, Solar X-Rays, Zeeman Effect
Scientific paper
The extremely Zeeman-sensitive 12.32 micron Mg I solar emission line was observed during a 3B/X5.7 solar flare on October 24, 1989. When compared to postflare values, Mg I emission-line intensity in the penumbral flare ribbon was 20 percent greater at the peak of the flare in soft X-rays, and the 12 micron continuum intensity was 7 percent greater. The flare also excited the emission line in the umbra where it is normally absent. The umbral flare emission exhibits a Zeeman splitting 200 G less than the adjacent penumbra, suggesting that it is excited at higher altitude. The absolute penumbral magnetic field strength did not change by more than 100 G between the flare peak and postflare period. However, a change in the inclination of the field lines, probably related to the formation and development of the flare loop system, was seen.
Deming Drake
Hewagama Tilak
Jennings Donald E.
Osherovich Vladimir
Wiedemann Günter
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