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Coronal Loops in Solar Active Regions

Published online by Cambridge University Press:  25 April 2016

C. J. Durrant  and
S. F. Brown
C. J. Durrant
Affiliation:
Department of Applied Mathematics, University of Sydney
S. F. Brown
Affiliation:
Department of Applied Mathematics, University of Sydney
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Abstract

We discuss the appearance of solar active regions as seen in EUV line radiation in terms of a system of simple static coronal loop models. The loop models are based on those of Rosner et al. (1978) and may be understood in terms of the scaling laws introduced by these authors. We present here some generalized scaling laws which demonstrate that the global properties of loops in fixed length are insensitive to everything but the overall heating rate or the basal pressure. The model and scaling laws appear to describe hot loops (T< 106K) well. Empirically determined temperatures and densities in cooler loops are not in agreement with coronal loop models.

We have computed a simple model of an active region using a dipole magnetic structure. The individual loop structures were calculated on the basis of the two different assumptions of constant basal pressure and of constant heating rate. This paper presents a preliminary discussion of the results and a comparison with observation.

Type
Solar
Information
Publications of the Astronomical Society of Australia , Volume 8 , Issue 2 , 1989 , pp. 137 - 141
Copyright
Copyright © Astronomical Society of Australia 1989

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