Observational evidence for thermal wave fronts in solar flares

Details Observational evidence for thermal wave fronts in solar flares Observational evidence for thermal wave fronts in solar flares

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..401r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 1, 1985, p. 401-409.

Astronomy and Astrophysics

Astrophysics

47

Magnetohydrodynamic Waves, Solar Atmosphere, Solar Flares, Solar Oscillations, Solar X-Rays, Wave Fronts, Chromosphere, H Alpha Line, Solar Corona

Scientific paper

Images in 3.5-30 keV X-rays obtained during the first few minutes of seven solar flares show rapid motions. In each case X-ray emission first appeared at one end of a magnetic field structure, and then propagated along the field at a velocity between 800 and 1700 km/s. The observed X-ray structures were 45,000-230,000 km long. Simultaneous H-alpha images were available in three cases; they showed brightenings when the fast-moving fronts arrived at the chromosphere. The fast-moving fronts are interpreted as electron thermal conduction fronts since their velocities are consistent with conduction at the observed temperatures of 1-3 x 10 to the 7th K. The inferred conductive heat flux of up to 10-billion ergs/s sq cm accounts for most of the energy released in the flares, implying that the flares were primarily thermal phenomena.

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