Time-dependent corona models - Dynamical response to perturbations

Details Time-dependent corona models - Dynamical response to perturbations Time-dependent corona models - Dynamical response to perturbations

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...220..177k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 220, no. 1-2, Aug. 1989, p. 177-184. Research supported by ASTRON and NWO.

Astronomy and Astrophysics

Astrophysics

4

Stellar Coronas, Stellar Models, Dynamic Response, Perturbation Theory, Time Dependence

Scientific paper

An implicit conservative upwind method is used to obtain numerical results for the dynamic response of a corona to instantaneous increase or decrease of the mechanical flux that heats the corona by dissipation. The analysis shows that the corona displays temporary unstable behavior when the transition region is out of energy balance, that thermal conduction quickly stabilizes the instablity, and that the corona finds a new stationary state as soon as wave fronts generated by the instablity and the changed pressure scale height have propagated out of the numerical grid. The results are interpreted in terms of physical time constants. Also considered is the stability of minimum flux coronas.

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