Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980soph...67...29b&link_type=abstract
Solar Physics, vol. 67, Aug. 1980, p. 29-46.
Astronomy and Astrophysics
Astronomy
24
Atmospheric Temperature, Radio Astronomy, Solar Atmosphere, Solar Magnetic Field, Temperature Gradients, Astronomical Maps, Bremsstrahlung, Faculae, Magnetic Field Configurations, Photosphere, Solar Temperature
Scientific paper
Simultaneous observations made at several wavelengths in microwave range using the high spatial resolution of radiotelescope RATAN-600 make it possible to develop methods of measuring the magnetic fields in the solar corona and the chromosphere. In this paper we develop a method of measuring the magnetic fields from thermal bremsstrahlung and demonstrate it, using observations of a flocculus (plage) during August 1-3, 1977. The observations show that the flocculus under investigation possessed bipolar magnetic structure with peak to peak amplitude of magnetic field strength of about 40 G at the level of the upper chromosphere and the transition region (with a r.m.s. error of 5.7 G for favourable conditions). The radio astronomical map of the magnetic field is in agreement with the Mt. Wilson magnetic field map to within the experimental error. It follows that the average longitudinal magnetic field above the flocculus does not drop significantly with height above the photosphere up to the CCTR (chromosphere-corona transition region). An analysis of the spectra of polarized radio emission also gives an opportunity to determine the temperature gradient in the CCTR (which proved to amount to about 1000 K km s-1 and to follow their variation with height.
Bogod Vladimir M.
Gelfreikh George B.
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