Time-dependent corona models - Global relaxation oscillations

Details Time-dependent corona models - Global relaxation oscillations Time-dependent corona models - Global relaxation oscillations

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...224..141k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 224, no. 1-2, Oct. 1989, p. 141-152. Research supported by NWO.

Astronomy and Astrophysics

Astrophysics

3

Magnetohydrodynamics, Shock Heating, Stellar Coronas, Stellar Models, Stellar Oscillations, Magnetoacoustics, Magnetohydrodynamic Waves, Shock Wave Interaction, Stellar Mass Ejection

Scientific paper

Time-dependent calculations of an overheated corona are presented. The heating is provided by the dissipation of acoustic sawtooth waves, calculated from weak shock-wave theory. If the heating flux exceeds a threshold value, the corona can no longer be stationary and extended. For a heating flux a few percent above that limit the corona undergoes a relaxation oscillation with a period of about 7 years. The corona is quasi-stationary for about 5 years. During the remaining 2 years the corona collapses and rebuilds again. During the collapse a density pulse cooled by high radiation loss rates falls to the star. Most of this pulse is absorbed by the photosphere but a small portion is reflected. The corona is completely absent for about one hour. After that the gas is heated again by mechanical dissipation and the corona expands to its quasi-stationary extended form. Seven cycles of the oscillation have been calculated and the last cycle is shown and explained in detail.

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