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Astron. Astrophys. 358, 749-752 (2000)

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Radio observations of a coronal mass ejection induced depletion in the outer solar corona

R. Ramesh and Ch.V. Sastry

Indian Institute of Astrophysics, Bangalore 560 034, India

Received 9 November 1999 / Accepted 23 March 2000


We report the first low frequency radio observations of a depletion that occurred in the outer solar corona in the aftermath of the CME event of 1986 June 5, with the large E-W one dimensional grating interferometer at the Gauribidanur radio observatory. We estimated the mass loss associated with the depletion and found that it agrees well with the value obtained through white light observations of the event. The radio brightness temperature at the location of the depletion was less by a factor of [FORMULA] compared to the ambient. The angular extent over which the decrease in brightness took place was [FORMULA]. The electron density variation was found to be proportional to [FORMULA]. Since observations at different wavelength bands have different physical origins, the radio method might be useful in independently estimating the characteristics of CME induced coronal depletions.

Key words: Sun: corona – Sun: particle emission – Sun: radio radiation

Send offprint requests to: ramesh@iiap.ernet.in

© European Southern Observatory (ESO) 2000

Online publication: June 8, 2000