Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh23a..06k&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SH23A-06
Physics
7513 Coronal Mass Ejections, 7534 Radio Emissions, 2139 Interplanetary Shocks
Scientific paper
The source regions of type II radio bursts lie upstream of high Mach number shocks. Evidence exists that the shocks are rippled, resulting in many emitting regions over the global shock surface. Goals of the upcoming STEREO mission include determining the precise three dimensional structure and location of these emitting regions, as well as investigating propagation and beaming effects. Here we present theoretical predictions from a new analytic, semi-quantitative model of interplanetary type II radio bursts, which involves electron reflection and acceleration at a shock moving through the inhomogeneous solar wind, beam formation upstream of the shock via time-of-flight effects, Langmuir wave growth driven by the electron beams, and the conversion of Langmuir waves into freely propagating radiation by nonlinear wave-wave processes. Two sets of predictions are presented for observations by the two, widely separated STEREO spacecraft: (1) dynamic spectra, and (2) images of the macroscopic source region. Both show the importance of solar wind inhomogeneities and varying observer location.
Cairns Iver H.
Knock S. A.
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