Center-to-limb variation of a sunspot-associated microwave source

Details Center-to-limb variation of a sunspot-associated microwave source Center-to-limb variation of a sunspot-associated microwave source

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..271a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 271-284.

Computer Science

Sound

38

Microwave Sounding, Solar Activity, Solar Magnetic Field, Solar Radio Emission, Sunspots, Astronomical Photography, Centimeter Waves, Circular Polarization, Magnetic Signatures

Scientific paper

Observations of the simple bipolar active region McMath 16862, obtained with the Westerbork Synthesis Radio Telescope at 6.16 cm over six consecutive days, indicate two bright sources associated with the region's two main spots, as well as some weaker emission that may be associated with loop structures. Application of a novel analytical method has allowed the mapping of the vertical as well as the horizontal component of the sunspot magnetic field at specific locations in the low corona. While the vertical component decreases away from the source's center, the horizontal component has both a radial and an azimuthal part. These results are interpreted in terms of a force-free magnetic field model, as well as in terms of a dipole whose axis is inclined to the vertical.

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