HR: 14:55h
AN: SH23A-06    [Abstracts]
TI: Predictions for STEREO: Dynamic Spectra and Source Regions of Type II Radio Bursts
AU: Knock, S A
EM: s.knock@physics.usyd.edu.au
AF: School of Physics,, The University of Sydney, Sydney, NSW 2006 Australia
AU: * Cairns, I H
EM: i.cairns@physics.usyd.edu.au
AF: School of Physics,, The University of Sydney, Sydney, NSW 2006 Australia
AB: 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.
DE: 7513 Coronal mass ejections
DE: 7534 Radio emissions
DE: 2139 Interplanetary shocks
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting