The magnetic field in the corona above sunspots at the eclipse of 1991 July 11
1993; IOP Publishing; Volume: 412; Linguagem: Inglês
10.1086/172931
ISSN1538-4357
AutoresDale E. Gary, Y. Leblanc, G. A. Dulk, L. Golub,
Tópico(s)Geomagnetism and Paleomagnetism Studies
Resumoview Abstract Citations (12) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Magnetic Field in the Corona above Sunspots at the Eclipse of 1991 July 11 Gary, D. E. ; Leblanc, Y. ; Dulk, G. A. ; Golub, L. Abstract A partial solar eclipse and an X-ray image are used to study the magnetic field as a function of height in the corona above an active region during the solar eclipse of July 11, 1991. The dominant features of AR 6718 are two leading spots of positive polarity followed by two spots of negative polarity about 3 arcmin to the east. Bright radio emission coincides with the positions of the sunspots, attributable to a gyroresonance radiation from ambient electrons above the spots. A simplified model of the source as a function of frequency based on the interferometer fringe amplitudes is used to obtain brightness temperature spectra for the emission associated with the sunspots. It is deduced that the magnetic field strength at the base of the corona above the leading spots was 1200 G, and about 1100 G above the following spots. The soft X-ray brightness above the sunspots was very low, about 30 times lower than that of the adjacent plage-associated emission. Publication: The Astrophysical Journal Pub Date: July 1993 DOI: 10.1086/172931 Bibcode: 1993ApJ...412..421G Keywords: Solar Corona; Solar Eclipses; Solar Magnetic Field; Sunspots; Brightness Temperature; Emission Spectra; Field Strength; Photosphere; Radio Spectra; Solar Arrays; X Ray Imagery; Solar Physics; ECLIPSES; SUN: CORONA; SUN: MAGNETIC FIELDS; SUN: SUNSPOTS full text sources ADS |
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