Solar Physics

, Volume 291, Issue 5, pp 1405–1416 | Cite as

Simultaneous Near-Sun Observations of a Moving Type IV Radio Burst and the Associated White-Light Coronal Mass Ejection

  • K. Hariharan
  • R. Ramesh
  • C. Kathiravan
  • T. J. Wang


We present rare contemporaneous low-frequency (\(< 100~\mbox{MHz}\)) imaging, spectral, and polarimetric observations of a moving type IV radio burst that had close spatio-temporal association with a white-light coronal mass ejection (CME) near the Sun. We estimate the electron density near the burst region from white-light coronagraph polarized brightness (pB) images of the CME as well as the two-dimensional radio imaging observations of the thermal free-free emission at a typical radio frequency such as 80 MHz. We analyze the burst properties such as the degree of circular polarization, the spectral index, and fine structures using the radio polarimeter and the radio spectral observations. The obtained results suggest that second harmonic plasma emission from the enhanced electron density in the leading edge of the CME is the cause of the radio burst. We determine the strength of the coronal magnetic field (\(B\)) for the first time based on this interpretation. The estimated value (\(B \approx 1\) gauss) in the CME leading edge at a heliocentric distance of \(\approx 2.2~R_{\odot }\) agrees well with the similar \(B\) values reported earlier based on other types of observations.


Coronal magnetic field Coronal mass ejections Sun: Radio bursts 



We thank the staff of the Gauribidanur Observatory for their help in observations and maintenance of the antenna and receiver systems there. The suggestions by the referee helped us to improve our results. We express our gratitude to Nathan Rich for his kind help in generating the SOHO/LASCO–C2 pB images. The SOHO data are produced by a consortium of the Naval Research Laboratory (USA), Max-Planck-Institut fuer Sonnensystemforschung (Germany), Laboratoire d’Astronomie (France), and the University of Birmingham (UK). SOHO is a project of international cooperation between ESA and NASA. The SOHO/LASCO CME catalog is generated and maintained at the CDAW Data Center by NASA and the Catholic University of America in cooperation with the Naval Research Laboratory. The SDO/AIA data are courtesy of the NASA/SDO and the AIA science teams. The work of TJW was supported by NASA Cooperative Agreement NNG11PL10A to CUA and NASA grant NNX12AB34G. We thank the PROBA2-SWAP team for providing open access to the images.


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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • K. Hariharan
    • 1
  • R. Ramesh
    • 1
  • C. Kathiravan
    • 1
  • T. J. Wang
    • 2
  1. 1.Indian Institute of AstrophysicsBengaluruIndia
  2. 2.Department of PhysicsThe Catholic University of America and NASA Goddard Space Flight CenterGreenbeltUSA

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