Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001izkry..97...26b&link_type=abstract
Izvestiya Krymskoj Astrofizicheskoj Observatorii, Tom 97, p. 26 - 42 (2001)
Astronomy and Astrophysics
Astronomy
Solar Eclipse 1999 August 11, Radio Observations
Scientific paper
The observations were carried out on two instruments simultaneously: optical telescope of Solar Service AFR-2 and the radio telescope RT-22 of CrAO using the radio polarimeter at wavelengths 3.5, 2.8, 2.3 and 2.0 cm. The parameters of the radio source connected with the sunspot group NOAA 8662 (SGD) were determined. Four fragments of the radio source with the dimensions of 8-24 arcseconds, the brightness temperatures 105-106K, the local magnetic fields in the range 100-600 gauss were picked out. The flux spectral indices have the different signs for the fragments over the small sunspots and over the pores. The comparison of optical and radio data showed that the dimensions of the fragments of radio source in intensity and circular polarisation are close and coincide with the dimensions of the small sunspot penumbra. The physical parameters and the possible mechanisms of radio emission for the different fragments of this active region are discussed.
Babin A. N.
Budzinovskaya I. A.
Mironov Andrew M.
Tsvetkov L. I.
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