Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366l..43w&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 366, Jan. 1, 1991, p. L43-L46.
Astronomy and Astrophysics
Astrophysics
34
Solar Corona, Solar Magnetic Field, Sunspots, Field Strength, Magnetic Flux, Nonuniform Magnetic Fields, Radio Emission, Very Large Array (Vla)
Scientific paper
It is shown that fields of 1800 G can exist in the corona based on observations of gyroresonance emission at 15 GHz at coronal temperatures. The strong fields occur in a small source radiating in the extraordinary (x) mode over the penumbra of a large symmetric sunspot. The optically-thin ordinary mode emission from the region shows a nearby peak at only 36,000 K which may be due to a sunspot plume, and a hole over the umbra consistent with the expected low-density material there. The x-mode source is highly asymmetric, despite the apparent symmetry of the sunspot, and its appearance and location imply that the strongest magnetic fields in the corona are localized in a compact flux tube.
Gopalswamy Nat
Kundu Mukul R.
White Stephen M.
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