Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982azh....59..563z&link_type=abstract
(Astronomicheskii Zhurnal, vol. 59, May-June 1982, p. 563-570.) Soviet Astronomy, vol. 26, May-June 1982, p. 340-344. Translati
Astronomy and Astrophysics
Astronomy
4
Magnetohydrodynamic Waves, Magnetosonic Resonance, Modulation, Solar Corona, Solar Radio Emission, Type 2 Bursts, Propagation Modes, Resonators, Shock Waves, Solar Atmosphere
Scientific paper
It is shown that the existence of a minimum of the Alfven speed in the corona at a height of about 1 solar radius follows from the characteristics of type II radio bursts. The region of a reduced Alfven speed is a resonator for fast magnetosonic (FMS) waves. The eigenmodes of the resonator are determined. The period of the fundamental mode is of the order of several minutes. In the resonator, FMS waves can be excited at the Cherenkov resonance by streams of energetic ions. Modulations of metal solar radio emission with a period of several minutes is explained by the effect of the propagation of radio waves through an oscillating magnetohydrodynamic resonator.
Stepanov Alexander V.
Zaitsev Valerii V.
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