On the role of hydromagnetic waves in the corona and the base of the solar wind

Details On the role of hydromagnetic waves in the corona and the base of the solar wind On the role of hydromagnetic waves in the corona and the base of the solar wind

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...52..163w&link_type=abstract

Solar Physics, vol. 52, Apr. 1977, p. 163-177.

Physics

25

Magnetohydrodynamic Waves, Solar Corona, Solar Wind, Chromosphere, Collisional Plasmas, Energy Dissipation, Magnetic Effects, Solar Heating, Solar Magnetic Field, Wave Attenuation, Wave Interaction

Scientific paper

Hydromagnetic waves are of interest for heating the corona or coronal loops and for accelerating the solar wind. This paper enumerates some of the limitations that must be considered before hydromagnetic waves are taken seriously. In the lowest part of the corona, waves interact so that a significant fraction of the coronal wave flux should have periods approximately equal to 10 s. If the problem of interest determines either a flux of wave energy or a dissipation rate, the distance that each wave mode can travel can be specified, and for at least one mode it must be consistent with the size and location of the region where the waves are to act. Heating of coronal loops observed by X-rays can be explained if the strength of the magnetic field along the loop lies within a rather narrow range and if the wave period is sufficiently short. In general, Alfven waves travel furthest and reach high into the corona and into the solar wind. The radial variation of the magnetic field is the most important parameter determining where the waves are dissipated. Heating of coronal helmets by Alfven waves is probable.

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