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Measurements of Solar Magnetic Fields Using Radio Observations with the RATAN-600

Published online by Cambridge University Press:  12 April 2016

G. B. Gelfreikh ,
V.M. Bogod ,
V. E. Abramov-Maximov  and
S.V. Tsvetkov
G. B. Gelfreikh
Affiliation:
Special Astrophysical Observatory, Russian Academy of Sciences, St. Petersburg 196140, Russia
V.M. Bogod
Affiliation:
Special Astrophysical Observatory, Russian Academy of Sciences, St. Petersburg 196140, Russia
V. E. Abramov-Maximov
Affiliation:
Pulkovo Astronomical Observatory, Russian Academy of Sciences, St. Petersburg 196140, Russia
S.V. Tsvetkov
Affiliation:
Pulkovo Astronomical Observatory, Russian Academy of Sciences, St. Petersburg 196140, Russia

Abstract

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Three ways of measuring magnetic fields in the corona and chromosphere have been developed based on spectral polarization observations with high spatial resolution using the radio telescope RATAN-600. The methods rely on effects from the theory of the generation and propagation of microwaves in the solar atmosphere: thermal bremsstrahlung, thermal cyclotron emission, and inversion of the polarization sign in quasi-transverse field regions. The new radio spectrograph (PAS) at the RATAN-600 resulted in higher accuracy measurements of the strength and structure of coronal magnetic fields. Using observations made with the PAS on 1992 January 10, we show that the magnetic field strength in the lower corona above all large sunspots can be measured with an accuracy ≈ 3%. The correlation with photospheric magnetic fields is good, ‘radio’ magnetic fields being weaker by ≈ 20%.

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. 271 - 274
Copyright
Copyright © Astronomical Society of the Pacific 1993

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