17 GHz Active Region Model Using Magnetogram Extrapolation

Details 17 GHz Active Region Model Using Magnetogram Extrapolation 17 GHz Active Region Model Using Magnetogram Extrapolation

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..415..207s&link_type=abstract

The Second Hinode Science Meeting: Beyond Discovery-Toward Understanding ASP Conference Series, Vol. 415, proceedings of a meeti

Astronomy and Astrophysics

Astronomy

Scientific paper

To reproduce the radio observations at 17 GHz from Nobeyama Radioheliograph (NoRH), a 3-D solar atmospheric model was constructed considering the thermal bremsstrahlung and gyro-resonance emission mechanisms. To estimate the magnetic field structure in the solar atmosphere, we have extrapolated photospheric magnetograms from MDI considering potential and force-free magnetic field extrapolations. The changes in the quiet Sun atmosphere (density and temperature distributions) due to the interaction with magnetic field were considered. Our model showed the following results for a highly polarized 17 GHz active region: a) the intensity of the MDI magnetograms is able to account for the emission as gyro-resonance, however, the problem with saturation points still persists; b) for a small number of saturation points, a simple linear correction can be applied; c) a gaussian fit to the magnetic field intensity was adjusted in magnetograms with large number of saturated points; d) the correction method could change completely the brightness temperature result; and e) the brightness temperature maxima results have a excellent correspondence with the observed values.

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