Time evolution of a miniflare as seen in H-alpha, UV lines, and X-rays

Details Time evolution of a miniflare as seen in H-alpha, UV lines, and X-rays Time evolution of a miniflare as seen in H-alpha, UV lines, and X-rays

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424.1022f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 2, p. 1022-1031

Astronomy and Astrophysics

Astrophysics

4

Carbon, Chromosphere, Evolution (Development), H Alpha Line, Solar Flares, Solar X-Rays, Ultraviolet Spectra, Astronomical Spectroscopy, Doppler Effect, Magnetic Signatures, Plasma Temperature, Polarimeters, Solar Magnetic Field, Solar Maximum Mission, Spectrographs, Spectrometers, Sunspots

Scientific paper

A miniflare that occurred in active region Hale 16896 on 1980 June 15 was observed in H-alpha, UV lines, and soft X-rays. These data allow us to analyze the flare emission and derive the energetics and dynamics of the chromospheric plasma involved. Our results indicate that the energy released by the miniflare was about 1028 ergs, about four orders of magnitude smaller than that of a large flare. However, hard X-rays (5.5-8.0 keV) were observed which indicated a plasma with temperature as high as 27 x 106 K. The H-alpha wings, C IV, and X-rays all showed a short-lived and compact (3 sec x 3 sec) brightening in a location near the leading sunspot. At this location, small-scale changes in the magnetic field were observed from about 2 hr before to about 6 hr after the miniflare. Only very small velocities seem to have been associated with most of the event in H-alpha. The data are consistent with short and dense loops at temperatures above 107 K which lost a large fraction of their energy via downward conduction through regions at the footpoints. Several secondary events appear to have been triggered by the miniflare along an arch filament which itself was not greatly affected. A number of much less energetic (1025-1026 erg) events preceded and followed the mini-flare. One of these occurred 11 minutes after the mini-flare and displayed a highly Doppler-shifted signature from the foot-point of a C IV arch. This arch delineates the connection that existed between the location of the mini-flare and the location of secondary events triggered by the flare.

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