Observations of the longitudinal magnetic field in the transition region and photosphere of a sunspot

Details Observations of the longitudinal magnetic field in the transition region and photosphere of a sunspot Observations of the longitudinal magnetic field in the transition region and photosphere of a sunspot

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...81..231h&link_type=abstract

Solar Physics, vol. 81, Dec. 1982, p. 231-244.

Physics

34

Magnetic Flux, Photosphere, Solar Magnetic Field, Spatial Distribution, Sunspots, Zeeman Effect, Circular Polarization, Magnetic Signatures, Polarimeters, Solar Maximum Mission, Spatial Resolution, Spectral Line Width, Ultraviolet Spectrometers, Umbras, Vertical Distribution

Scientific paper

The Ultraviolet Spectrometer and Polarimeter on the Solar Maximum Mission spacraft has observed for the first time the longitudinal component of the magnetic field by means of the Zeeman effect in the transition region above a sunspot. The data presented here were obtained on three days in one sunspot, have spatial resolutions of 10 arcsec and 3 arcsec, and yield maximum field strengths greater than 1000 G above the umbrae in the spot. The method of analysis, including a line-width calibration feature used during some of the observations, is described in some detail in an appendix; the line width is required for the determination of the longitudinal magnetic field from the observed circular polarization. The transition region data for one day are compared with photospheric magnetograms from the Marshall Space Flight Center. Vertical gradients of the magnetic field are compared from the two sets of data; the maximum gradients of 0.41 to 0.62 G/km occur above the umbra and agree with or are smaller than values observed previously in the photosphere and low chromosphere.

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