Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21a1584l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH21A-1584
Physics
6984 Waves In Plasma (7867), 7534 Radio Emissions, 7847 Radiation Processes, 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
A recently developed simulation model is used to investigate the effects of varying the coronal and electron heating conditions on the dynamic spectra of coronal type III bursts observed at Earth. The flux of 2fp emission is significantly higher than that of fp emission, which is unlikely to be observable except under very favorable propagation conditions. Moreover, the 2fp emission is unlikely to continue into the solar wind, although some bursts are very strong and will extend into the upper corona with lower frequencies than simulated, consistent qualitatively with observations. The flux and brightness temperature of 2fp emission are affected significantly by variations in the parameters, while the frequency drift rate and half-power duration are affected only weakly. Further, the simulations confirm the standard interpretation of the drift rate of 2fp emission in terms of the plasma density profile and an average beam speed that agrees quantitatively with the simulated beam dynamics, for wide ranges of coronal and heating conditions. For weak heating events or events with high coronal electron temperature, the remote radiation shows characteristics that agree quantitatively with microbursts. When the heating is even weaker and/or the electron temperature is even higher, the heating events are radio-quiet, consistent qualitatively with hard X-ray observations. For similar heating originating in similar frequency ranges different density models yield quantitatively similar results except for the drift rate. Variations of the levels of a given density profile, corresponding to background corona or coronal streamers, can also cause significant changes in spectral characteristics.
Cairns Iver H.
Li Baowen
Robinson Adam P.
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