Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.204..263c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 204, no. 2, p. 263-281.
Astronomy and Astrophysics
Astrophysics
1
Coronal Loops, Current Density, Magnetic Field Configurations, Solar Magnetic Field, Electrical Resistivity, Magnetic Flux, Ohmic Dissipation, Plasma Interactions
Scientific paper
We present a set of cylindrically-symmetric force-free magnetic fields with nonconstant scalar function scalar alpha. We found that the kink instability of the fields can be suppressed by reducing the length of the flux tube. By using the pressure profile in coronal magnetic loops, obtained on the basis of the observational data, and by neglecting the effect of gravity, these force-free fields are modified to non-force-free ones. For the plasma of finite conductivity the time and space dependent magnetic fields are obtained, and the ohmic dissipation per unit volume per second is calculated. For the magnetic fields, presented in the investigation, it is also found that, due to the large electrical conductivity of the plasma, the ohmic dissipation is negligable in comparison to the conduction and the radiation loss. Hence, for the energy equilibrium in a coronal loop, the contribution of ohmic dissipation is insignificant.
Chandra Suresh
Prasad Lalan
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