OBSERVATIONS OF TYPE III RADIO BURSTS BY THE STEREO/WAVES INSTRUMENTS

Details OBSERVATIONS OF TYPE III RADIO BURSTS BY THE STEREO/WAVES INSTRUMENTS OBSERVATIONS OF TYPE III RADIO BURSTS BY THE STEREO/WAVES INSTRUMENTS

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41b1646k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH41B-1646

Astronomy and Astrophysics

Astrophysics

[7534] Solar Physics, Astrophysics, And Astronomy / Radio Emissions

Scientific paper

Type III radio bursts belong among the most intense interplanetary electromagnetic emissions observed in the solar wind. A field-aligned beam of fast electrons (connected with coronal mass ejections or solar flares) produces Langmuir waves which are afterward converted into the electromagnetic waves. The STEREO spacecraft mission gives us a great opportunity for observations of the type III radio bursts. The S/WAVES instruments provide us with goniopolarimetric measurements, allowing us to investigate directions of the wave vectors and apparent source sizes. In our study the Singular Value Decomposition method for multi-component propagation analysis of electromagnetic plasma waves is used to estimate the apparent source sizes. We consider three different shapes of the source: uniform, spherical and Gaussian. Estimation of the apparent source size of the type III radio bursts could yield information on the density fluctuations in the solar wind, taking into account scattering of the primary radio beam pattern. We implement a ray tracing method to estimate properties of the sources and of the solar wind medium. We present its first results.

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