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Electron-Beam Evolution in Partially Ionized Hydrogenic Plasma with Return Currents

Published online by Cambridge University Press:  12 April 2016

D. V. Syniavskii  and
V. V. Zharkova
D. V. Syniavskii
Affiliation:
Physics Department, Kiev University, Kiev 252022, Ukraine
V. V. Zharkova
Affiliation:
Physics Department, Kiev University, Kiev 252022, Ukraine Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, Scotland, UK

Abstract

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This paper presents the kinetic equation solution for beam electrons injected during solar flares from the corona to the chromosphere, consisting of hydrogenic plasma with partial ionization. The electrons are considered to lose their energy both in collisional processes with the charged and neutral species of ambient plasma and in ohmic heating by return currents induced in the plasma by beam electrons. The evolution of the energy and angular distributions of energetic electrons is calculated as functions of the column density. The bulk of the electron-beam energy stored in low-energy electrons is shown to be lost in the ambient plasma heating, less via Coulomb collisions at the lower corona and more via ohmic dissipation at the upper chromosphere. More energetic electrons with energies above 120 keV can reach the chromospheric levels with a weak ionized plasma, where a decrease of the Coulomb collisions and the induced electric field of a return current produce beams as well directed as on the top boundary. The X-ray bremsstrahlung polarization is shown to be positive in the range 5%-10%. It is very sensitive to the emergent photon energies below 40 keV and to angles of view for all of the X-ray radiation range.

Subject headings: acceleration of particles — plasmas — Sun: flares — Sun: X-rays, gamma rays

Type
Poster Papers
Information
International Astronomical Union Colloquium , Volume 142: Particle Acceleration Phenomena in Astrophysical Plasmas , 1994 , pp. 729 - 734
Copyright
Copyright © The American Astronomical Society 1994

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