skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Strong magnetic fields and inhomogeneity in the solar corona

Abstract

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.

Authors:
; ;  [1]
  1. Maryland Univ., College Park (USA)
Publication Date:
OSTI Identifier:
6159667
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal; (USA)
Additional Journal Information:
Journal Volume: 366; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

White, S M, Kundu, M R, and Gopalswamy, N. Strong magnetic fields and inhomogeneity in the solar corona. United States: N. p., 1991. Web. doi:10.1086/185905.
White, S M, Kundu, M R, & Gopalswamy, N. Strong magnetic fields and inhomogeneity in the solar corona. United States. https://doi.org/10.1086/185905
White, S M, Kundu, M R, and Gopalswamy, N. 1991. "Strong magnetic fields and inhomogeneity in the solar corona". United States. https://doi.org/10.1086/185905.
@article{osti_6159667,
title = {Strong magnetic fields and inhomogeneity in the solar corona},
author = {White, S M and Kundu, M R and Gopalswamy, N},
abstractNote = {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.},
doi = {10.1086/185905},
url = {https://www.osti.gov/biblio/6159667}, journal = {Astrophysical Journal; (USA)},
issn = {0004-637X},
number = ,
volume = 366,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}