Gasdynamic response of the atmosphere to pulse heating - Two-temperature approximation

Details Gasdynamic response of the atmosphere to pulse heating - Two-temperature approximation Gasdynamic response of the atmosphere to pulse heating - Two-temperature approximation

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995azh....72..381b&link_type=abstract

Astronomicheskij Zhurnal, vol. 72, p. 381

Astronomy and Astrophysics

Astronomy

4

Chromosphere, Gas Dynamics, Pulse Heating, Plasma Equilibrium, Electron Energy, Atmospheric Heating, Ion Temperature, Heat Flux, Approximation

Scientific paper

Explosive evaporation of the chromosphere during powerful pulse flares is modeled numerically. Possible separation of electron and ion temperatures is taken into account. A chromosphere column with a fixed pressure at its upper boundary is abruptly subject to heating, distributed over the mass and lasting 10 s. Two phases of the process are confirmed: in the first tenths of a second, the temperature of the upper chromosphere increases, while its density remains almost unchanged; then, a quasi-equilibrium flow of plasma forms, with a jump of temperature and a radiative shock, both moving downward. For a prolonged heating with a rectangular time profile, a new effect was found. The effect is due to the higher efficiency of heat flux from coronal layers to chromospheric ones: in the heat-wave region, jumps of pressure are formed from time to time; these jumps result in the propagation of velocity perturbations upward and downward from the contact discontinuity. In the upper part of the flow, the electron temperature exceeds ion temperature by a factor of up to 4 by the end of the heating, in spite of the fact that periodic propagation of weak perturbations from the contact discontinuity slightly reduces this difference. Results of one- and two-temperature approximations are compared. Possible observational manifestatious of the process modeled are discussed.

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