Solar Physics

, Volume 290, Issue 1, pp 95–114 | Cite as

Dynamics of Flare Processes and Variety of the Fine Structure of Solar Radio Emission over a Wide Frequency Range of 30 – 7000 MHz

  • Gennady Chernov
  • Valery Fomichev
  • Baolin Tan
  • Yihua Yan
  • Chengming Tan
  • Qijun Fu
New Eyes Looking At Solar Activity
First Online:
Received:
Accepted:

Abstract

Radiobursts exhibiting fine structure observed over two years during the rising phase of Cycle 24 by the Chinese Solar Broadband Radio Spectrometer (SBRS/Huairou) in the range 1 – 7.6 GHz and the spectrograph IZMIRAN in the meter range (25 – 270 MHz) are analyzed. In five events the zebra structure, various fiber bursts, and fast pulsations were observed. These observations have great importance for testing different theoretical models of fine structure formation, as, for example, only for explaining the zebra structure more than ten mechanisms have been proposed. The events on 15 and 24 February 2011 are of the greatest interest. In the course of the flare on 15 February (which occurred close to the center of disk) the zebra structure was observed during three sequential flare brightenings. The polarization changed sign in the third. This behavior of polarization combined with images of the corresponding flare brightenings, obtained in extreme ultraviolet radiation by the Solar Dynamics Observatory (SDO/AIA, 171 Å), provides important clues. The polarization of radio emission in all three cases is related to the ordinary wave mode of radio emission. The zebra structure was present at frequencies 190 – 220 MHz in the Culgoora spectrum. The event on 24 February 2011 is remarkable, as the zebra structure at frequencies of 2.6 – 3.8 GHz was not polarized and it appeared during the magnetic reconnection observed by SDO/AIA 171 Å in this limb flare. In the event on 9 August 2011, for the first time, a superfine millisecond structure was registered simultaneously in the fast pulsations and the stripes of the zebra structure. In the event on 1 August 2010 after the zebra structure two families of fibers bursts with opposite frequency drifts were observed. On 19 April 2012 the fibers against the background of type III bursts were observed by IZMIRAN and Nançay spectrographs. In the band of 42 – 52 MHz a group of nine slowly drifting narrow-band (</∼ 1 MHz) fibers formed a unique type II burst. Almost all events in the microwave range contain superfine structure in the form of the millisecond spikes, whose emission should be considered primary. It is possible that each type of fine structure is excited by the same mechanism, and the broad variety of events observed is related to the dynamics of flare processes.

Keywords

Sun: flares Sun: fine structure Sun: microwave radiation 
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Notes

Acknowledgements

We are grateful to the Nobeyama, SOHO (LASCO/EIT), and SDO/AIA teams for operating the instruments and performing the basic data reduction, and especially for their open data policies.

This work was supported by a Chinese Academy of Sciences Visiting Professorship for Senior International Scientists, grant No. 2011T1J20), and partially supported by the Russian Foundation of Basic Research (RFBR), grant Nos. 14–02–00367. The National Basic Research Program of the Ministry of Science and Technology of China (Grant No. 2006CB806301) and CAS-NSFC Key Project (Grant No. 10778605) provided support for the Chinese authors.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Gennady Chernov
    • 1
    • 2
  • Valery Fomichev
    • 2
  • Baolin Tan
    • 1
  • Yihua Yan
    • 1
  • Chengming Tan
    • 1
  • Qijun Fu
    • 1
  1. 1.Key Laboratory of Solar Activity, National Astronomical ObservatoriesChinese Academy of SciencesBeijingChina
  2. 2.Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave PropagationRussian Academy of Sciences (IZMIRAN)Troitsk, MoscowRussia

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