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Title: Identification of the Source Region of a ``Halo'' Coronal Mass Ejection Using Meter-Wavelength Radio Data
Authors: Kathiravan, C
Ramesh, R
Keywords: Sun: Solar-terrestrial Relations;Sun: Activity;Sun: Corona;Sun: Radio Radiation
Issue Date: Jul-2005
Publisher: The American Astronomical Society
Citation: Astrophysical Journal, Vol. 627, No. 1, Part 2, pp. L77 - L80
Abstract: We present meter-wavelength observations of the solar corona close to the onset of the ``halo'' coronal mass ejection (CME) of 1998 January 21 and estimate the change in electron density with time through a reproduction of the observed two-dimensional radio brightness distribution using a ray-tracing technique. Our calculations show that the average density above the background in the southeast quadrant of the corona overlying the visible solar disk had increased significantly (from 0 to 18), in the aftermath of the CME liftoff. This indicates that the source region of the event must have been located at a lower level of the solar atmosphere in that area. The rate of mass injection corresponding to the above change in density was found to be ~8.8×10/sup15 g hr/sup-1.
ISSN: 0004-637X
Appears in Collections:IIAP Publications

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