Three-dimensional structures of magnetostatic atmospheres. IV - Magnetic structures over a solar active region

Details Three-dimensional structures of magnetostatic atmospheres. IV - Magnetic structures over a solar active region Three-dimensional structures of magnetostatic atmospheres. IV - Magnetic structures over a solar active region

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..300l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 1, p. 300-312.

Astronomy and Astrophysics

Astrophysics

58

Magnetostatics, Solar Activity, Solar Atmosphere, Solar Magnetic Field, Sunspots, Three Dimensional Models, Differential Equations, Electric Current, Force-Free Magnetic Fields, Magnetic Field Configurations, Magnetic Flux, Plasma Interactions

Scientific paper

A static model is presented for the long-lived structures over a solar active region dominated by a pair of sunspots of opposite magnetic polarities. The magnetic field is approximately force-free high in the atmosphere but interacts strongly with the plasma and gravity in the lower region through cross-field electric currents. Basic atmospheric features long discussed in the literature can be reproduced in realistic geometry, such as the density depletion over a sunspot, magnetic shear, and levitated magnetic flux ropes interpretable as chromospheric filaments. Explicit solutions showing these features are described and compared, with a discussion of the implications for the interpretation of vector-magnetograph data. These solutions are illustrative examples taken from a large set obtainable by transforming the magnetostatic equations to solvable, linear differential equations given in the preceding paper in this series.

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