Analysis of the multiple inversion of the circular polarization of sunspot-associated microwave sources.

Details Analysis of the multiple inversion of the circular polarization of sunspot-associated microwave sources. Analysis of the multiple inversion of the circular polarization of sunspot-associated microwave sources.

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998r%26qe...41..169r&link_type=abstract

Radiophys. Quantum Electron., Vol. 41, No. 3, p. 169 - 176

Physics

Solar Microwave Radiation: Polarization, Solar Microwave Radiation: Solar Corona, Solar Microwave Radiation: Solar Magnetic Fields

Scientific paper

Solar observations with the new panoramic spectrum analyzer (PSA) of RATAN-600 showed multiple inversion of the sense of circular polarization in microwave local sources (LSs). The polarization spectra of the LSs are analyzed in terms of the theory of linear coupling of ordinary and extraordinary modes in the quasitransverse (QT) region. The author considers the RATAN-600 radio observations of 1977 Jun 2, 1992 Jan 10, May 9 and 10, 1992 for the LSs, which demonstrated the inversion of the polarization sense in the range 2.0 - 6.5 cm. The theory of QT propagation imposes a constraint on the degree of polarization of microwaves at wavelengths close to the inversion wavelength. The dependence of the multiple inversion on the wavelength due to multiple crossing of QT regions is verified. The LS polarization spectra are correlated with the spectra calculated for a varied multiplicity to determine more accurately the multiplicity of the inversion. The author proposes that the multiple inversion is due to the fine structure of the coronal magnetic field. The analysis of this phenomenon allows the coronal magnetic field in the active region to be determined simultaneously at several heights.

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