Strong magnetic fields and inhomogeneity in the solar corona

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/185905· OSTI ID:6159667

White, S M; Kundu, M R; Gopalswamy, N ^[1]

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1. Maryland Univ., College Park (USA)

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. 21 refs.

• OSTI ID: 6159667
• Journal Information: Astrophysical Journal; (USA), Vol. 366; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SOLAR CORONA
MAGNETIC FIELDS
DENSITY
MAGNETIC FLUX
RADIOWAVE RADIATION
SUNSPOTS
ATMOSPHERES
ELECTROMAGNETIC RADIATION
PHYSICAL PROPERTIES
RADIATIONS
SOLAR ACTIVITY
STARSPOTS
STELLAR ACTIVITY
STELLAR ATMOSPHERES
STELLAR CORONAE
640104* - Astrophysics & Cosmology- Solar Phenomena