Space and time distribution of hard X-ray emission in a loop at the beginning of a flare

Details Space and time distribution of hard X-ray emission in a loop at the beginning of a flare Space and time distribution of hard X-ray emission in a loop at the beginning of a flare

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..202k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 283, no. 1, p. 202-214

Astronomy and Astrophysics

Astrophysics

6

Chromosphere, Electron Bombardment, Solar Flares, Spatial Distribution, Stellar Models, Temporal Distribution, X Rays, Electron Density (Concentration), Energy Distribution, Hydrodynamics, Magnetic Mirrors

Scientific paper

Using a 1-D hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations included the effects of the return-current that reduces signifcantly the depth of the chromospheric layer which is evaporated. These computations were made to study the contribution of various processes - chromospheric evaporation, mirroring and high pitch angle of superthermal electrons - to the hard X-ray emission at the top of a loop at the very beginning of flares. Therefore the present modelling was made with superthermal electron parameters coresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109 erg cm-2/sec. Chromospheric evaporation density waves generated at both feet of the loop propagate up to the top, where they collide and cause a temporary electron density enhancement. Electron mirroring at magnetic mirrors increases the population of superthermal electrons at the top loop. These two processes lead to hard X-ray emission at the top of the loop and dominate over the effect of high pitch-angle superthermal electrons.

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