Physics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph..100..435d&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 100, Oct. 1985, p. 435-463.
Physics
45
Solar Activity, Solar Flares, Temporal Distribution, Filaments, H Alpha Line, Plasma Heating, Solar Corona, Solar Prominences, Solar X-Rays, Stellar Mass Ejection
Scientific paper
A review is given of observations and theories relating to the solar flare of 21 May 1980 at 20:50 UT, the best studied flare on record. For more than 30 hr before the flare, there was filament activation and plasma heating to above 10 MK. A flare precursor was present earlier than 6 minutes before the flare onset. The flare started with filament activation (20:50 UT), followed by thick-target heating of two footprints and subsequent ablation and convective evaporation involving energies of 1 to 2 x 10 to the 31 ergs. Coronal explosions occurred at 20:57 UT (possibly associated with a type-II burst) and at 21:04 UT (associated with an H-alpha spray?) Post-flare loops were first seen at 20:57 UT, and their upward motion is interpreted as a manifestation of successive field-line reconnections. A type-IV radio burst which later changed into a type-I noise storm was related to a giant coronal arch located just below the radio noise storm region. Some implications and difficulties these observations present to current flare theories are mentioned.
de Jager Cornelis
Svestka Zdenek
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