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Detection of a cyclotron line in the radio spectrum of a solar active region and its interpretation

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Abstract

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.

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Authors and Affiliations

  1. Special Astrophysical Observatory, St. Petersburg Branch, St. Petersburg, Russia

    V. M. Bogod & V. I. Garaimov

  2. Institute of Applied Physics, Nizhnii Novgorod, Russia

    V. V. Zheleznyakov & E. Ya. Zlotnik

Authors
  1. V. M. Bogod
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  2. V. I. Garaimov
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  3. V. V. Zheleznyakov
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  4. E. Ya. Zlotnik
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Translated from Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 77, No. 4, 2000, pp. 313–320.

Original Russian Text Copyright © 2000 by Bogod, Garaimov, Zheleznyakov, Zlotnik.

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Bogod, V.M., Garaimov, V.I., Zheleznyakov, V.V. et al. Detection of a cyclotron line in the radio spectrum of a solar active region and its interpretation. Astron. Rep. 44, 271–277 (2000). https://doi.org/10.1134/1.163850

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  • DOI: https://doi.org/10.1134/1.163850

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