Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh43a1929c&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH43A-1929
Physics
Plasma Physics
[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7534] Solar Physics, Astrophysics, And Astronomy / Radio Emissions, [7845] Space Plasma Physics / Particle Acceleration, [7851] Space Plasma Physics / Shock Waves
Scientific paper
Type II bursts involve electron acceleration at shocks, either driven by coronal mass ejection (CMEs) or blast waves. The standard theory involves the formation of beams of accelerated electrons upstream of the shock, the generation of electrostatic Langmuir waves near the local electron plasma frequency fp, and the production of radiation near fp and near 2fp by various linear and nonlinear processes involving Langmuir waves. Over the last ten years analytic descriptions of this physics have been developed and then combined into a numerical model that predicts the radiation produced as a macroscopic rippled shock moves with an assumed velocity profile through models of the inhomogeneous corona and solar wind. These background plasma profiles are now produced by combining plasma and magnetic field data at 1 AU (Wind or ACE) with power-law radial profiles, guided by the Parker solar wind model and empirical temperature models. This paper has three primary goals. First, to demonstrate that combining the type II theory with data-driven solar wind models yields dynamic spectra that agree well with several well-observed type II events. The agreement in the details of the dynamic spectra (correlation coefficients of 40 - 50% and offsets in time and frequency that are less than 10%) and agreement of the typical emission level to within a factor of 10 is very good for a cradle-to-grave theory with no free parameters and a limited solar wind model. These initial data-theory comparisons suggest that the present theory for type II bursts agrees broadly with the available observations. Second, to describe refinements of the type II theory that enable an entirely analytic description of all aspects of the theory. Third, to present the first results of a new numerical code that couples the output of MHD simulations of self-consistent shock evolution through a background corona with the analytic type II theory. These results suggest that the goals of understanding type II bursts in detail and using them to probe the corona and solar wind are realistic and achievable.
Cairns Iver H.
Hillan D. S.
Robinson Adam P.
Schmidt Manuel J.
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