Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...627l..77k&link_type=abstract
The Astrophysical Journal, Volume 627, Issue 1, pp. L77-L80.
Astronomy and Astrophysics
Astronomy
4
Sun: Solar-Terrestrial Relations, Sun: Activity, Sun: Corona, Sun: Radio Radiation
Scientific paper
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 ~8.8×1015 g hr-1.
Kathiravan C.
Ramesh Ramamoorthy
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