Hydrodynamic response of the solar chromosphere to an elementary flare burst. II - Thermal model

Details Hydrodynamic response of the solar chromosphere to an elementary flare burst. II - Thermal model Hydrodynamic response of the solar chromosphere to an elementary flare burst. II - Thermal model

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...81..281s&link_type=abstract

Solar Physics, vol. 81, Dec. 1982, p. 281-292.

Physics

31

Chromosphere, Magnetohydrodynamic Flow, Solar Flares, Solar X-Rays, Thermal Radiation, High Temperature Plasmas, Hot Electrons, Magnetic Flux, Plasma Heating, Shock Heating, Solar Corona, Solar Electrons, Solar Temperature

Scientific paper

Impulsive heating of the upper chromosphere by a very powerful thermal flux is studied as the cause of hard X-rays during a solar flare. The physical formulation of the hydrodynamic problem is presented, with all basic processes except radiative cooling of the plasma are considered as one-dimensional due to a strong magnetic field. A vertical magnetic tube is treated, using the one-fluid, two-temperature approximation. The Lagrange variable which is the plasma depth from the source along the magnetic tube is introduced. A numerical solution is found which gives the distributions of electron and ion temperatures, of velocity and plasma density over the column depth. It is found that the saturation effect and hydrodynamic flow along a magnetic field lead to electron temperature and density distributions such that the thermal X-ray spectrum of a high-temperature plasma can be well approximated by an exponential law or by two power law spectra.

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