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Reversal of the Sense of Polarisation in Solar and Stellar Radio Flares

Published online by Cambridge University Press:  25 April 2016

D. B. Melrose  and
P. A. Robinson
D. B. Melrose
Affiliation:
Research Centre for Theoretical Astrophysics, and Department of Theoretical Physics, School of Physics, University of Sydney, Sydney, NSW 2006
P. A. Robinson
Affiliation:
Research Centre for Theoretical Astrophysics, and Department of Theoretical Physics, School of Physics, University of Sydney, Sydney, NSW 2006
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Abstract

It is shown that numerical integration of the equation of polarisation transfer for generalised Faraday rotation provides an alternative to mode-coupling theory for treating propagation through a quasi-transverse (QT) region. At a QT region, where the sign of the component of the magnetic field along the ray path reverses, the sense of circular polarisation reverses below a frequency ωt, and is unchanged above ωt. There is a long-standing difficulty in the interpretation of the polarisation of radio emission from bipolar regions on the Sun: observational and theoretical estimates of ωt appear inconsistent. The alternative approach may help resolve this difficulty.

Type
Solar and Solar System
Information
Publications of the Astronomical Society of Australia , Volume 11 , Issue 1 , April 1994 , pp. 16 - 20
Copyright
Copyright © Astronomical Society of Australia 1994

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