Faraday-rotation fluctuations during radio occultation of the circumsolar plasma

Details Faraday-rotation fluctuations during radio occultation of the circumsolar plasma Faraday-rotation fluctuations during radio occultation of the circumsolar plasma

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993astl...19...57e&link_type=abstract

Astronomy Letters, Vol. 19, p. 57-61; Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 19, no. 2, p. 143-152. In Russia

Astronomy and Astrophysics

Astronomy

15

Faraday Effect, Magnetohydrodynamic Waves, Radio Occultation, Solar Wind Velocity, Helios 2, Spectral Correlation

Scientific paper

Results are presented of an analysis of the Faraday rotation fluctuations of linearly polarized signals from the Helios-2 spacecraft, which were measured in 1977 during radio occultation of the circumsolar plasma at a wavelength of 13 cm. It is shown that the observed fluctuations have a characteristic period of 6-10 min. The velocity of the irregularities' motion at heliocentric distances of 2.8-3.4 solar radii is greater than 200 km/s, i.e., significantly higher than the solar wind velocity. From a comparison of the results obtained with theoretical models it is concluded that Faraday fluctuations are connected with low-frequency Alfven waves propagating from the sun.

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