Abstract
We present a set of cylindrically-symmetric force-free magnetic fields with non-constant scalar function scalarα. 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 ars 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.
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Chandra, S., Prasad, L. A new expression for cylindrically-symmetric magnetic fields in coronal magnetic loops. Astrophys Space Sci 204, 263–281 (1993). https://doi.org/10.1007/BF00658029
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DOI: https://doi.org/10.1007/BF00658029