Modeling of the Radio Metric Emission of the Quiet Sun Corona Using Potential Field Source Surface Extrapolations

Details Modeling of the Radio Metric Emission of the Quiet Sun Corona Using Potential Field Source Surface Extrapolations Modeling of the Radio Metric Emission of the Quiet Sun Corona Using Potential Field Source Surface Extrapolations

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh24a..05m&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SH24A-05

Physics

7509 Corona, 7524 Magnetic Fields, 7534 Radio Emissions

Scientific paper

We present the result of a modeling of the Quiet Sun corona in the metric radio range (F~150-450 MHz). At these frequencies, the radio emission is dominated by non-thermal emissions (plasma emissions) due to populations of accelerated electrons, and, when the solar activity is low or moderate, by the thermal emission of the corona (bremsstrahlung). While this emission mechanism is well known, depending only on the electron density and temperature, the difficulties arise from the refraction that affects the radio waves propagating in the corona, which depends on the electron density distribution. In order to build a realistic description of the electron and temperature distribution in the corona for a given date, we have used Potential Field Source Surface extrapolations, based on synoptic maps of the photospheric magnetic field. The density and temperature distribution is based on scaling laws which depend on the field strength as well as the length of the loops. We use radio data from the Nancay Radioheliograph to constraint the free parameters of these scaling laws, and make qualitative and quantitative comparisons between the radio images and the simulations.

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