A comparison of the height distributions of solar flare hard X-rays in thick target and thermal models

Details A comparison of the height distributions of solar flare hard X-rays in thick target and thermal models A comparison of the height distributions of solar flare hard X-rays in thick target and thermal models

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..711e&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 711-720.

Statistics

Computation

47

Atmospheric Models, Bremsstrahlung, Solar Atmosphere, Solar Flares, Solar X-Rays, Spatial Distribution, Chromosphere, Electron Beams, Energy Dissipation, Height, Nonthermal Radiation, Temperature Distribution, X Ray Scattering

Scientific paper

Using recent observations of solar hard X-ray bursts having a spatial resolution of a few arcsec, a computation is made of the theoretically predicted spatial variation of hard X-ray flux versus height in both thick target nonthermal and thermal models of solar hard X-ray bursts. The work on the thick target model revises previous results in this area by adopting a more realistic model for the flaring atmospheric structure and also by taking into account energy loss and scattering processes in the evolution of the nonthermal electron beam which have previously been neglected. It is noted that in the so-called 'thermal' model currently in vogue there is a substantial nonthermal bremsstrahlung component at all photon energies; it is further demonstrated that this nonthermal component results in a hard X-ray flux versus height distribution whose maximum brightness per unit length is, similarly to the thick target model, located in the chromosphere and not in the thermal source itself. The characteristics of the hard X-ray height distributions in both thick target and thermal models are summarized and compared.

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