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Microwave observations with the RATAN-600 radio telescope: detection of the thermal emission sources

Published online by Cambridge University Press:  01 September 2008

Irina Yu. Grigoryeva ,
Larisa K. Kashapova ,
Moisey A. Livshits  and
Valery N. Borovik
Irina Yu. Grigoryeva
Affiliation:
Central Astronomical Observatory at Pulkovo RAS, 196140 Pulkovskoe sh., 65/1, St. Petersburg, Russia. email: [email protected]
Larisa K. Kashapova
Affiliation:
Institute of Solar-Terrestrial Physics SD RAS, Irkutsk, Russia. email: [email protected]
Moisey A. Livshits
Affiliation:
Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, 142190 Troitsk, Russia. email: [email protected]
Valery N. Borovik
Affiliation:
Central Astronomical Observatory at Pulkovo RAS, 196140 Pulkovskoe sh., 65/1, St. Petersburg, Russia. email: [email protected]
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Abstract

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We report on two off-limb radio sources of microwave emission which were detected in one-dimensional RATAN-600 solar scans of the post-eruptive loops: on December 2, 2003 (off west limb) and January 25, 2007 (east limb). The microwave spectra showed that the thermal emission was predominant at the early stage of the arcade formation with a small contribution of non-thermal emission. There were no high-energy particles in these events. The microwave spectra of the radio sources associated with the tops of postflare loops show the predominant thermal emission during one hour after the eruption. In case of a small contribution from accelerated particles to the microwave emission, there is a large amount of hot plasma in the region of the loop tops after the eruption.

Keywords

Sun: radio radiationflaresparticle emissioncoronal mass ejections (CMEs)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S257: Universal Heliophysical Processes , September 2008 , pp. 177 - 179
Copyright
Copyright © International Astronomical Union 2009

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