Detection of wave phenomena in the solar corona using radio occultation methods

Details Detection of wave phenomena in the solar corona using radio occultation methods Detection of wave phenomena in the solar corona using radio occultation methods

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14...93e&link_type=abstract

Advances in Space Research, vol. 14, no. 4, p. (4)93-(4)96

Physics

Plasma Physics

Electron Density (Concentration), Radio Occultation, Solar Corona, Solar Wind, Solar Wind Velocity, Wave Propagation, Magnetohydrodynamics, Magnetosonic Resonance, Plasma Physics, Plasma Waves, Satellite Observation, Spaceborne Astronomy

Scientific paper

Solar wind irregularities modulate the radio waves propagating in the solar corona and super-corona. The magnitude of the fluctuations is determined by the intensity of electron density irregularities and their characteristic period by the irregularities velocity. Detailed analysis shows however that the velocity registered in radio occultation experiments is actually a combination of two velocities, namely the velocity of plasma flows and that of the magnetohydrodynamic waves. This feature may manifest itself in several maxima in the correlation functions of the frequency fluctuations in signals registered at several ground stations. The interaction of plasma flows with the magnetosonic waves propagating from and toward the Sun results correspondingly in higher and lower apparent velocity of the irregularities. It was proved in radio occultation data obtained using spacecraft Venera-15, -16, Viking, and Voyager.

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