Simulations of the Quiet Sun Emission at Metric and Decimetric Radio Wavelengths

Details Simulations of the Quiet Sun Emission at Metric and Decimetric Radio Wavelengths Simulations of the Quiet Sun Emission at Metric and Decimetric Radio Wavelengths

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.7104m&link_type=abstract

American Astronomical Society Meeting 204, #71.04; Bulletin of the American Astronomical Society, Vol. 36, p.797

Astronomy and Astrophysics

Astronomy

Scientific paper

In the metric and decimetric radio range, solar emission is dominated by non-thermal radiation from electron populations accelerated during flares or continuous processes. When the solar activity is low, mainly during the solar cycle minimum, the thermal emission from the corona can be mapped, and structures such as coronal holes, active regions or filament cavities can be observed. The radio thermal emission is sensitive to the electron density and temperature, and radio rays suffer refraction effects when their frequency is close to the local plasma frequency. A model of the electron density and temperature distribution is thus needed to compute the thermal radiation at a given frequency. Axisymetric and homogeneous electron density models have been successfully used for the last fourty years to described the basic properties of this thermal emission. Nevertheless, these density models are not suitable for describing the corona at a given date.
We present in this poster more realistic simulations using a Potential Field Source Surface extrapolation and realistic electron density distributions. Assuming hydrostatic equilibrium, the density is determined by the strength of the magnetic field and the length of the magnetic loops: n=n0(B,L)*f(r). Different n0 and f functions are used and the corresponding results are compared to real data.

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