An Electron Density Model above the Sunspot from a Mapping of NOAA 7260 at 17 GHz

Details An Electron Density Model above the Sunspot from a Mapping of NOAA 7260 at 17 GHz An Electron Density Model above the Sunspot from a Mapping of NOAA 7260 at 17 GHz

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chjaa...2..287y&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 2, p. 287-292

Astronomy and Astrophysics

Astrophysics

Sun: Activity, Sunspots, Sun: Radio Radiation, Sun: Chromosphere

Scientific paper

The brightness temperature distribution of microwave emission in a solar active region generally shows a ring structure, with a dip at the centre. However, no dip was found in the Nobeyama Radioheliograph left handed circular polarization (LCP) image on 1992 August 18; instead, there was a peak. This is a completely LCP source with zero right-handed circular polarization (RCP). We examine this structure in terms of the joint effect of gyroresonance and bremsstrahlung mechanism with a raised electron density above the central part of the sunspot, and the commonly assumed temperature and vertical dipole magnetic field models. The raised electron density is found to be 1.4 × 1011 cm-3 at the chromosphere base.

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