Solar Physics

, 293:53 | Cite as

Decameter Type IV Burst Associated with a Behind-the-limb CME Observed on 7 November 2013

  • V. N. Melnik
  • A. I. Brazhenko
  • A. A. Konovalenko
  • V. V. Dorovskyy
  • H. O. Rucker
  • M. Panchenko
  • A. V. Frantsuzenko
  • M. V. Shevchuk
Radio and Space-based Observations
Part of the following topical collections:
  1. Combined Radio and Space-based Solar Observations: From Techniques to New Results

Abstract

We report on the results of observations of a type IV burst made by the Ukrainian Radio interferometer of the Academy of Sciences (URAN-2) in the frequency range 22 – 33 MHz. The burst is associated with a coronal mass ejection (CME) initiated by a behind-the-limb active region (N05E151) and was also observed by the Nançay Decameter Array (NDA) radio telescope in the frequency band 30 – 60 MHz. The purpose of the article is the determination of the source of this type IV burst. After analysis of the observational data obtained with the URAN-2, the NDA, the Solar-Terrestrial Relations Observatory (STEREO) A and B spacecraft, and the Solar and Heliospheric Observatory (SOHO) spacecraft, we come to the conclusion that the source of the burst is the core of a behind-the-limb CME. We conclude that the radio emission can escape the center of the CME core at a frequency of 60 MHz and originates from the periphery of the core at a frequency of 30 MHz that is due to occultation by the solar corona at the corresponding frequencies. We find plasma densities in these regions assuming the plasma mechanism of radio emission. We show that the frequency drift of the start of the type IV burst is governed by an expansion of the CME core. The type III bursts that were observed against this type IV burst are shown to be generated by fast electrons propagating through the CME core plasma. A type II burst was registered at frequencies of 44 – 64 MHz and 3 – 16 MHz and was radiated by a shock with velocities of about \(1000~\mbox{km}\,\mbox{s}^{-1}\) and \(800~\mbox{km}\,\mbox{s}^{-1}\), respectively.

Keywords

Coronal mass ejections, initiation and propagation Radio bursts, meter-wavelengths and longer (m, dkm, hm, km) Radio bursts, type II Radio bursts, type III Radio bursts, type IV 

Notes

Acknowledgements

We thank the referee for useful remarks and suggestions that improved the manuscript.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Radio AstronomyNational Academy of Sciences of UkraineKharkovUkraine
  2. 2.Gravimetrical ObservatoryPoltavaUkraine
  3. 3.Commission for AstronomyAustrian Academy of SciencesGrazAustria
  4. 4.Space Research InstituteAustrian Academy of SciencesGrazAustria

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