Models for Stellar Coronae - Comparison with the Minimum Flux Corona Theory

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Coronal models calculated using the iterative two boundary value method of solution (Hearn and Vardavas, 1981) are compared with the predictions of the minimum flux corona theory applied to an isothermal, spherically symmetric corona (Hearn, 1975). For those coronal models for which an isothermal corona is a reasonable approximation, the minimum flux corona theory predicts the pressure of the transition region for a given flux of mechanical energy to within 30%. It predicts average coronal temperatures which are within 11% of the energy weighted average coronal temperatures calculated for the models. The minimum flux corona theory overestimates the mechanical flux needed to yield a given mass loss from the corona by a factor of 3. Although these calculations are somewhat limited in range they show that the minimum flux corona theory is consistent with a corona heated by a mechanism which is specified in detail, contrary to the criticisms of Endler et al. (1979) and Mangeney and Souffrin (1979). Further, these calculations show that for a dissipation mechanism which is specified in detail, the minimum flux corona theory may be used to predict to within 30% the flux of mechanical energy at the transition region.

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