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Plasma Beta above a Solar Active Region View all abstracts by submitter

G. Allen Gary   Submitted: 2001-08-01 13:29

In this paper, we present a model of the plasma beta above an active region and discuss its consequences in terms of coronal magnetic field modeling. The beta-plasma model is representative and derived from a collection of sources. The resulting beta variation with height is used to emphasize the assumption that the magnetic pressure dominates over the plasma pressure must be carefully considered depending on what part of the solar atmosphere is being considered. This paper points out (1) that the paradigm that the coronal magnetic field can be constructed from a force-free magnetic field must be used in the correct context, since the force-free region is sandwiched between two regions which have beta>1, (2) that the chromospheric MgII-CIV magnetic measurements occur near the beta-minimum, and (3) that, moving from the photosphere upwards, beta can return to 1 at relatively low coronal heights, e.g. R~1.2Rs.

Authors: G. Allen Gary
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Publication Status: in press
Last Modified: 2001-08-01 13:31
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