On the origin of 140GHz emission from the 4 July 2012 solar flare

Tsap, Y. T., Smirnova, V. V., Morgachev, A. S., Motorina, G. G., Kontar, E. P. , Nagnibeda, V. G. and Strekalova, P. V. (2016) On the origin of 140GHz emission from the 4 July 2012 solar flare. Advances in Space Research, 57(7), pp. 1449-1455. (doi:10.1016/j.asr.2015.12.037)

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Abstract

The sub-THz event observed on the 4 July 2012 with the Bauman Moscow State Technical University Radio Telescope RT-7.5 at 93 and 140 GHz as well as Kislovodsk and Metsähovi radio telescopes, Radio Solar Telescope Network (RSTN), GOES, RHESSI, and SDO orbital stations is analyzed. The spectral flux between 93 and 140 GHz has been observed increasing with frequency. On the basis of the SDO/AIA data the differential emission measure has been calculated. It is shown that the thermal coronal plasma with the temperature above 0.5 MK cannot be responsible for the observed sub-THz flare emission. The non-thermal gyrosynchrotron mechanism can be responsible for the microwave emission near 10 GHz but the observed millimeter spectral characteristics are likely to be produced by the thermal bremsstrahlung emission from plasma with a temperature of about 0.1 MK.

Item Type:Articles
Additional Information:. This work was particularly fulfilled within the framework of the Saint Petersburg State University Project No. 6.0.26.2010 and partially supported by the Programs of the Presidium of the Russian Academy of Sciences P-21 and P-22, the Russian Foundation for Basic Research (projects No.13-02-00277 A, 14-02-00924 A, 15-02-08028 A, and 13-02-90472-ukr-f-a), the International Foundation of Technology and Investment (project No.01/00515) and the EU FP7 IRSES Grant 295272 ‘RadioSun’.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kontar, Dr Eduard
Authors: Tsap, Y. T., Smirnova, V. V., Morgachev, A. S., Motorina, G. G., Kontar, E. P., Nagnibeda, V. G., and Strekalova, P. V.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Advances in Space Research
Publisher:Elsevier
ISSN:0273-1177
Published Online:31 December 2015
Copyright Holders:Copyright © 2016 Elsevier Ltd.
First Published:First published in Advances in Space Research 57(7): 1449-1455
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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