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Simultaneous radio and white light observations of the 1984 June 27 coronal mass ejection event

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Abstract

We present the two-dimensional imaging observations of radio bursts in the frequency range 25–50 MHz made with the Clark Lake multifrequency radioheliograph during a coronal mass ejection event (CME) observed on 1984, June 27 by the SMM Coronagraph/Polarimeter and Mauna Loa K-coronameter. The event was spatially and temporally associated with precursors in the form of meter-decameter type III bursts, soft X-ray emission and a Hα flare spray. The observed type IV emission in association with the CME (and the Hα spray) could be interpreted as gyrosynchrotron emission from a plasmoid containing a magnetic field of ∼2.5 G and nonthermal electrons with a number density of ∼ 105 cm−3 and energy ≳350 keV.

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On leave from Indian Institute of Astrophysics, Kodaikanal, India.

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Gopalswamy, N., Kundu, M.R. Simultaneous radio and white light observations of the 1984 June 27 coronal mass ejection event. Sol Phys 114, 347–362 (1987). https://doi.org/10.1007/BF00167350

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