A hydrodynamic model of the gradual phase of the solar flare loop

Details A hydrodynamic model of the gradual phase of the solar flare loop A hydrodynamic model of the gradual phase of the solar flare loop

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..328g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, July 20, 1990, p. 328-337. Research supported by the National Natural

Astronomy and Astrophysics

Astrophysics

35

Chromosphere, Coronal Loops, Hydrodynamics, Solar Flares, Stellar Models, Atmospheric Heating, Atmospheric Temperature, Cooling, Evaporation, Solar X-Rays

Scientific paper

The hydrodynamic cooling process after the maximum phase of a solar flare has been simulated numerically, with improvements on the chromospheric radiative loss and the resolution of the transition region, together with the introduction of the mechanism of chromospheric heating by coronal soft X-rays. At the early stage of the gradual phase, chromospheric evaporation continues to take place and the transition region moves further downward. At the middle stage of the gradual phase, the corona atmosphere appears to have a quasi-periodic oscillation, and the transition region remains at the same position for a long time. At the later stage to of the gradual phase, the descent of coronal material does not happen, and the atmosphere evolves into a state with high density and low temperature. Finally, the atmosphere does not reach the quiet-sun conditions directly, and it would perhaps undergo a process of instability and develop into the stage of postflare loop. The efficiency of flare soft X-ray heating of the chromosphere is also discussed.

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