Type II solar radio bursts: Modeling and extraction of shock parameters

Details Type II solar radio bursts: Modeling and extraction of shock parameters Type II solar radio bursts: Modeling and extraction of shock parameters

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jgra..11703104h&link_type=abstract

Journal of Geophysical Research, Volume 117, Issue A3, CiteID A03104

Physics

Plasma Physics

1

Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Solar Wind Plasma, Solar Physics, Astrophysics, And Astronomy: Radio Emissions, Space Plasma Physics: Radiation Processes, Space Weather: Models

Scientific paper

This first paper in a two part series summarizes the current theory and the data-driven solar wind model for simulating dynamic spectra of type II radio bursts. It also introduces performance metrics and techniques for extraction of model shock parameters from these dynamic spectra. We use an iterative downhill simplex method which compares two dynamic spectra and quantitatively assesses and improves the agreement using two figures of merit: the first is based on the correlation function and the second is based on a normalized differences over the data set. By maximizing the agreement we are able to extract the input model shock parameters to within 30% or better when using model solar winds of increasing complexity. The effects on the spectra predicted and on the figures of merit from changing the model shock parameters and solar wind model are also investigated. The iterative downhill extraction method is then applied to the type II dynamic spectrum predicted using a realistic model solar wind and a shock model estimated for an observed type II event. The shock parameters are recovered to within 10% of the correct solution.

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