Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...134..185h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 134, no. 1, May 1984, p. 185-188.
Astronomy and Astrophysics
Astrophysics
7
Force-Free Magnetic Fields, Solar Magnetic Field, Solar Radio Emission, Sunspots, Brightness Distribution, Centimeter Waves, Circular Polarization, Gyromagnetism, Radiative Transfer
Scientific paper
As a first example of extensive model calculations, radio emission features are presented which were calculated for the solar active region McMath 12417 on July 4, 1973, using force-free extrapolated magnetic fields with constant alpha. The magnetic field data were derived from magnetographic measurements, and height distributions of temperature and electron density from a semi-empirical sunspot model by Staude (1981) based on recent X-, EUV-, and optical data. In contrast to the rather simple magnetic field structure, a complex structure of the S-component source at a test wavelength of 6 cm is obtained, exhibiting a dip of brightness temperature above the sunspot center, a weakly polarized pseudo-loop structure at maximum intensity surrounding the center, and a ring of high circular polarization at the outer edge of the source.
Hildebrandt Joachim
Krueger Andre
Seehafer Norbert
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