Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000arep...44..271b&link_type=abstract
Astronomy Reports, Volume 44, Issue 4, April 2000, pp.271-277
Astronomy and Astrophysics
Astronomy
5
Scientific paper
Observations of the active region AR 7962 obtained at 2 32 cm on the RATAN-600 radio telescope on May 10 12, 1996, are presented. The high-resolution measurements detected a narrow feature near 8.5 cm against the background of the smooth spectrum of the local source associated with sunspots. This narrow-band emission is identified with a bright, pointlike, high-frequency source at 1.7 cm recorded on maps made using the Nobeyama radio telescope. The characteristics of the observed line (lifetime 3 days, brightness temperature of the order of several million Kelvin, relative width of about 10%) suggest that it can be explained as thermal cyclotron radiation at the third harmonic of the electron gyrofrequency from a compact source containing a dense, hot plasma; the corresponding higher frequency emission could be due to thermal Bremsstrahlung. Analysis of the RATAN-600 and Nobeyama data can be used to probe the magnetic field, kinetic temperature, and electron density in the radiation source in the corona.
Bogod Vladimir M.
Garaimov Vladimir I.
Zheleznyakov Vladimir V.
Zlotnik Ya. E.
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