The inter-relationship of hard X-ray and EUV bursts during solar flares

Details The inter-relationship of hard X-ray and EUV bursts during solar flares The inter-relationship of hard X-ray and EUV bursts during solar flares

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...57..175e&link_type=abstract

Solar Physics, vol. 57, Mar. 1978, p. 175-190.

Physics

33

Far Ultraviolet Radiation, Magnetohydrodynamic Waves, Solar Flares, Solar X-Rays, Wave Propagation, Energy Spectra, Photons, Solar Activity Effects, Synchronism, Thermal Emission

Scientific paper

The synchronism between solar hard X-ray bursts and impulsive EUV flare emission is investigated. Certain aspects of the previously proposed hypothesis of EUV flare heating by X-ray emitting electrons are studied quantitatively using data on five comparatively large flares observed in hard X-rays by the ESRO TD-1A satellite. The validity of alternative flare-heating models (electron bombardment and deposition of energy either conducted or convected downward from the high-temperature site of primary energy release) is tested by employing the degree of synchronism between thermal and nonthermal emissions to place a limit on the necessary propagation speed of the energy-transport process as well as by examining the energy balance and determining whether a particular model predicts an EUV emission compatible with the observations. The hypothesis of a common mechanism with a time scale of the order of seconds for energy transport is shown to be justified. It is concluded that the observed degree of synchronism could be produced by either electron bombardment or heating by MHD waves. The observations are discussed in terms of Brown's (1973) thick-target electron model.

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