Spectroscopic far ultraviolet observations of transition zone instabilities and their possible role in a pre-flare energy build-up

Details Spectroscopic far ultraviolet observations of transition zone instabilities and their possible role in a pre-flare energy build-up Spectroscopic far ultraviolet observations of transition zone instabilities and their possible role in a pre-flare energy build-up

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...47..127b&link_type=abstract

(NASA, IAU, IUGG, and International Council of Scientific Unions, Workshop on Flare Build-up Study, Falmouth, Mass., Sept. 8-11,

Physics

15

Electron Transitions, Far Ultraviolet Radiation, Solar Corona, Solar Flares, Solar Spectra, Dynamic Stability, Line Shape, Skylab Program, Solar Activity Effects, Spectral Line Width, Spectroheliographs

Scientific paper

Highly flare-productive newly emerging active regions are characterized by numerous small low-lying loops which frequently show a chaotic pattern. Flare activity in such a region subsides as the chaotic loop structures relax and expand into a bipolar configuration. The transition zone in such an active region is highly unstable, as shown by broadened and shifted nonthermal line profiles of medium-ionized elements like Si III, Si IV, and C IV. These transition-zone instabilities, which occur as isolated events in active regions of low flare productivity, are often observed prior to flares. Transition-zone instabilities can be traced to the footpoints of active loops and seem to be accompanied by heating of the loop. The loops vary in size and show differing degrees of activity, with the brightest and most compact ones seemingly being in a pre-flare state which results in the catastrophic energy release along the loop during a flare.

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