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Dynamics of microwave brightness distribution in the giant 24 August 2002 flare loop

Published online by Cambridge University Press:  01 September 2008

Veronika E. Reznikova ,
Victor F. Melnikov ,
Kiyoto Shibasaki ,
Sergey P. Gorbikov ,
Nikolai P. Pyatakov ,
Irina N. Myagkova  and
Haisheng Ji
Veronika E. Reznikova
Affiliation:
Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China Radiophysical Research Institute (NIRFI), Nizhny Novgorod, Russia
Victor F. Melnikov
Affiliation:
Radiophysical Research Institute (NIRFI), Nizhny Novgorod, Russia
Kiyoto Shibasaki
Affiliation:
Nobeyama Radio Observatory, NAOJ, Nagano, Japan
Sergey P. Gorbikov
Affiliation:
Radiophysical Research Institute (NIRFI), Nizhny Novgorod, Russia
Nikolai P. Pyatakov
Affiliation:
Radiophysical Research Institute (NIRFI), Nizhny Novgorod, Russia
Irina N. Myagkova
Affiliation:
Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, Russia
Haisheng Ji
Affiliation:
Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China Big Bear Solar Observatory, New Jersey Institute of Technology, Big Bear City, USA
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Abstract

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We have found a similar tendency of the spatial dynamics at 34 GHz for all major temporal sub-peaks of the burst with the re-distribution of the brightness from the footpoints (on the rising phase of each peak) to the upper part of the loop (on the decay phase). Observed dynamics is interpreted by the re-distribution of accelerated electrons number density with their relative enhancement in the loop top. Results of diagnostics show that the ratio of non-thermal electron number density in the loop top and in the footpoint changes 7 times from the peak to decay phase. Model simulations by solving the Fokker-Planck equation allowed to determine an injection type which is able to result in necessary dynamics of energetic electrons.

Keywords

solar flaremicrowave radiationmagnetic loop
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S257: Universal Heliophysical Processes , September 2008 , pp. 345 - 347
Copyright
Copyright © International Astronomical Union 2009

References

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Melnikov, V. F., Shibasaki, K., & Reznikova, V. E. 2002, ApJ, 480, L185CrossRefGoogle Scholar
Ramaty, R. 1969, ApJ, 158, 753CrossRefGoogle Scholar