Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41b1647l&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH41B-1647
Physics
Plasma Physics
[6954] Radio Science / Radio Astronomy, [7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7534] Solar Physics, Astrophysics, And Astronomy / Radio Emissions, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Observations show that the electron and ion temperatures in the corona vary with coronal height, both monotonically and with localized structures, and sometimes the ion temperature can be higher than the electron temperature. A recently developed simulation model is generalized to include the effects of these spatial variations on the dynamic spectra of coronal type III bursts observed at Earth. Simulation predictions are made for type III spectral characteristics such as the radio flux and time duration for both monotonic and localized spatial variations in the electron and ion temperatures. For monotonic variations the spectral characteristics change monotonically. However, pronounced changes, such as significant enhancements and/or suppressions of the radio flux, occur when the temperatures vary locally. The changes result from the combined effects of modifications in the dynamics of electron beam, plasma waves, and radio waves in the source region, and in the radiation during its propagation. This work points towards future remote sensing of coronal and interplanetary plasma characteristics using type III bursts.
Cairns Iver H.
Li Baowen
Robinson Adam P.
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