Preflare characteristics of active regions observed in soft X-rays

Details Preflare characteristics of active regions observed in soft X-rays Preflare characteristics of active regions observed in soft X-rays

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...62..347k&link_type=abstract

Solar Physics, vol. 62, June 1979, p. 347-357.

Physics

18

Solar Corona, Solar Flares, Spaceborne Telescopes, X Ray Imagery, Electron Density (Concentration), H Alpha Line, Skylab Program, Time Response

Scientific paper

X-ray images from the AS&E telescope on Skylab are used to investigate coronal conditions in solar active regions during the 20-min periods preceding the X-ray onsets of small flares. The preflare or precursor phase is defined as a phase with a characteristic length or time scale significantly different from that of the rise phase. We show that there is no observational evidence of a requirement for a coronal preflare heating phase with a time scale longer than 2 min for small flares characterized by one or two loops. In 18 out of 25 cases the flaring X-ray structure was not the brightest feature in the preflare active region. The electron densities are estimated for preflare loops.

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