Gasdynamic models of solar flares

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Gas Dynamics, Solar Electrons, Solar Flares, Solar Temperature, Chromosphere, Energy Spectra, Incident Radiation, Photosphere, Shock Heating, Solar Corpuscular Radiation

Scientific paper

It is noted that a flux of electrons with an inverse power-law energy spectrum (for energies of at least 10 keV) from the corona is incident on the chromosphere every 100 sec. Taking gas viscosity into account, the temperature, velocity, density, and ionization distributions of the gas from which this flux originates are calculated for four different power-law exponents and four values of the particle energy flux during heating and cooling in open and closed models of a flare region. The basic conclusions of previous calculations with less input data are confirmed. It is shown that accounting for viscosity permits one to derive clearly the heating of the gas by shock waves and to examine the interaction of large energy fluxes. Properties of heating and cooling are discussed in the context of a closed model corresponding to the structure of an arch-like magnetic field whose ends extend into the photosphere.

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