Physics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...64..287h&link_type=abstract
Solar Physics, vol. 64, Dec. 1979, p. 287-301.
Physics
34
Atmospheric Heating, Magnetic Field Configurations, Magnetohydrodynamic Waves, Solar Atmosphere, Solar Corona, Collisionless Plasmas, Landau Damping, Plasma Density, Propagation Modes, Solar Spectra
Scientific paper
A possible mechanism for the formation and heating of coronal loops through the propagation and damping of fast mode waves is proposed and studied in detail. Loop-like field structures are represented by a dipole field with the point dipole at a given distance below the solar surface. The density of the medium is determined by hydrostatic equilibrium along the field lines in an isothermal atmosphere. The fast mode waves propagating outward from the coronal base are refracted into regions with a low Alfven speed and suffer collisionless damping when the gas pressure becomes comparable to the magnetic pressure. The propagation and damping of these waves are studied for three different cases: a uniform density at the coronal base, a density depletion within a given flux tube, and a density enhancement within a given flux tube. The fast mode waves are found to be important in the formation and heating of the loops if the wave energy flux density is of the order 100,000 ergs/sq cm s at the coronal base.
Holzer Thomas Edward
Leer Egil
Rifai Habbal Shadia
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