Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2909d&link_type=abstract
American Astronomical Society Meeting 210, #29.09; Bulletin of the American Astronomical Society, Vol. 39, p.138
Astronomy and Astrophysics
Astronomy
Scientific paper
We apply ring-diagram technique to high-resolution Global Oscillation Network Group (GONG) Dopplergrams in order to examine the source regions of halo coronal mass ejections (CMEs). We study the changes in acoustic mode parameters such as frequency, line width, and amplitude before, during, and after CMEs. The CMEs were chosen to have a wide variety of source regions, including active regions, filament regions, and transequatorial filament regions. We find that regions associated with low magnetic flux that produce CMEs have shorter line widths than corresponding quiet regions. This implies a longer lifetime or slow damping process for the oscillation modes. We suggest that this characteristic could be useful in modeling CMEs or forecasting regions in which CMEs may occur. This work is carried out through the National Solar Observatory Research Experiences for Undergraduate (REU) site program, which is co-funded by the Department of Defense in partnership with the National Science Foundation REU Program.
Clark Rebecca
DeWet Stephanie
Hill F. F.
Jain Kunal
Tripathy Sushant C.
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