A single loop of 21 January 1974 flare

Details A single loop of 21 January 1974 flare A single loop of 21 January 1974 flare

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...61..407h&link_type=abstract

Solar Physics, vol. 61, Mar. 1979, p. 407-417.

Physics

28

Loops, Solar Flares, Solar Prominences, Emission Spectra, Iron, Skylab Program, Spectroheliographs

Scientific paper

A single loop associated with a flare of 21 January 1974 was studied with NRL spectroheliograms in order to understand the phenomenon of 'evaporation'. The loop seen in the emission lines of Fe XV reached its maximum brightness 15 min after the onset. The loop is different from a flare loop because of the time sequence in which it appeared and is different from a post-flare loop prominence system because of its morphology. The electron density in the loop increases gradually to 4 x 10 to the 10th/cu cm. The material of the loop is thought to be supplied from the lower atmosphere of the chromosphere or the photosphere. The loop is an associated phenomenon of the main flare event distinguished by a longer rise time (15 min) and a lower peak temperature (2 million K).

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