Title: Solar magnetic field studies using the 12 micron emission lines. I - Quiet sun time series and sunspot slices
Abstract: view Abstract Citations (64) References (60) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Solar Magnetic Field Studies Using the 12 Micron Emission Lines. I. Quiet-Sun Time Series and Sunspot Slices Deming, Drake ; Boyle, Robert J. ; Jennings, Donald E. ; Wiedemann, Gunter Abstract The use of the extremely Zeeman-sensitive IR emission line Mg I, at 12.32 microns, to study solar magnetic fields. Time series observations of the line in the quiet sun were obtained in order to determine the response time of the line to the five-minute oscillations. Based upon the velocity amplitude and average period measured in the line, it is concluded that it is formed in the temperature minimum region. The magnetic structure of sunspots is investigated by stepping a small field of view in linear 'slices' through the spots. The region of penumbral line formation does not show the Evershed outflow common in photospheric lines. The line intensity is a factor of two greater in sunspot penumbrae than in the photosphere, and at the limb the penumbral emission begins to depart from optical thinness, the line source function increasing with height. For a spot near disk center, the radial decrease in absolute magnetic field strength is steeper than the generally accepted dependence. Publication: The Astrophysical Journal Pub Date: October 1988 DOI: 10.1086/166806 Bibcode: 1988ApJ...333..978D Keywords: Emission Spectra; Infrared Spectra; Line Spectra; Solar Magnetic Field; Sunspots; Zeeman Effect; Fourier Transformation; H Alpha Line; Solar Atmosphere; Solar Interior; Solar Limb; Solar Physics; INFRARED: SPECTRA; SUN: MAGNETIC FIELDS; SUN: SUNSPOTS; ZEEMAN EFFECT full text sources ADS | Related Materials (4) Erratum: 1989ApJ...338.1193D Part 2: 1993ApJS...86..313H Part 3: 2000ApJ...533.1035M Part 4: 2002ApJ...568.1043J