Threedimensional Structures of Magnetostatic Atmospheres. IV. Magnetic Structures over a Solar Active Region
Abstract
A static model is presented for the longlived structures over a solar active region dominated by a pair of sunspots of opposite magnetic polarities. The magnetic field is approximately forcefree high in the atmosphere but interacts strongly with the plasma and gravity in the lower region through crossfield 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 vectormagnetograph 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.
 Publication:

The Astrophysical Journal
 Pub Date:
 November 1992
 DOI:
 10.1086/171925
 Bibcode:
 1992ApJ...399..300L
 Keywords:

 Magnetostatics;
 Solar Activity;
 Solar Atmosphere;
 Solar Magnetic Field;
 Sunspots;
 Three Dimensional Models;
 Differential Equations;
 Electric Current;
 ForceFree Magnetic Fields;
 Magnetic Field Configurations;
 Magnetic Flux;
 Plasma Interactions;
 Solar Physics;
 MAGNETOHYDRODYNAMICS: MHD;
 SUN: ACTIVITY;
 SUN: SUNSPOTS