Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..137..257j&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 137, Feb. 1992, p. 257-271.
Physics
Force-Free Magnetic Fields, Magnetic Field Configurations, Solar Atmosphere, Solar Magnetic Field, Atmospheric Models, Coronal Loops, Gravitational Effects
Scientific paper
Previous work of Browning and Priest (1984, 1986) is extended by studying the equilibrium path of twisted and untwisted thin flux tubes in a stratified, isothermal atmosphere using as the ambient field a linear force-free field. When an untwisted flux tube is considered, shearing the magnetic arcade provides a different form to change the parameter lambda which characterizes the external atmosphere, but at the same time this introduces a limitation in the width allowed for the external arcade. The critical width found for the different analytical cases considered is always greater than one arch of the ambient arcade which prevents an eruption inside the arcade. In the case of twisted flux tubes, an analytical solution can be found for the critical lambda c, which separates regimes of strong and weak gravity, and the shape of the flux tube is now dependent on beta, a parameter which represents the magnetic field enhancement of the loop at the photosphere.
Ballester Jose Luis
Juan J.
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