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Coronal Magnetic Fields from the Effect of the Double Inversion of Circular Polarization of Radio Emission

Published online by Cambridge University Press:  12 April 2016

V.M. Bogod ,
G.B. Gelfreikh ,
B.I. Ryabov  and
S.R. Hafizov
V.M. Bogod
Affiliation:
Special Astrophysical Observatory, Russian Academy of Sciences, St. Petersburg 196140, Russia
G.B. Gelfreikh
Affiliation:
Special Astrophysical Observatory, Russian Academy of Sciences, St. Petersburg 196140, Russia
B.I. Ryabov
Affiliation:
Special Astrophysical Observatory, Russian Academy of Sciences, St. Petersburg 196140, Russia
S.R. Hafizov
Affiliation:
Special Astrophysical Observatory, Russian Academy of Sciences, St. Petersburg 196140, Russia

Abstract

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We present preliminary results of radio observations of the Sun with the Panoramic Analyzer of the Spectrum (21 channels in 1.8 – 8.2 cm wavelength range) of the radio telescope RATAN-600. Observations on 1992 January 9 – 10 have shown double inversion of the sign of a local source through the microwave wavelength range with fine spectral structure. This phenomenon can be treated as a result of mode coupling when the electromagnetic wave crosses two regions of quasi-transverse propagation (QT-region). Using this treatment we have found the strength of the coronal magnetic field at a number of points in the corona above an active region. The results also imply that trans-equatorial coronal arches affect the structure of magnetic fields at heights of about 3 . 1010 cm with B ~ 5 – 10 G.

Type
Session 5. Fields in the Chromosphere and Corona
Information
International Astronomical Union Colloquium , Volume 141: The Magnetic and Velocity Fields of Solar Active Regions , 1993 , pp. 302 - 305
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

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Zheleznyakov, V.V. 1970, Radio Emission of the Sun and Planets, (New York: Pergamon Press)Google Scholar