A relation between magnetic field strength and temperature in sunspots

Details A relation between magnetic field strength and temperature in sunspots A relation between magnetic field strength and temperature in sunspots

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..141..253k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 141, no. 2, p. 253-265.

Physics

71

Line Spectra, Magnetohydrostatics, Solar Magnetic Field, Sunspots, Zeeman Effect, Infrared Spectroscopy, Iron, Penumbras, Umbras

Scientific paper

We present Stokes I Zeeman splitting measurements of sunspots using the highly sensitive (g = 3) Fe I line at a wavelength of 1.5649 micron. The splittings are compared with simultaneous intensity measurements in the adjacent continuum. The relation between magnetic field strength and temperature has a characteristic, nonlinear shape in all the spots studied. In the umbra, there is an approximately linear relation between B super 2 and Tb, consistent with magnetohydrostatic equilibrium in a nearly vertical field. A distinct flattening of the B super 2 vs Tb relationship in the inner penumbra may be due to changes in the lateral pressure balance as the magnetic field becomes more horizontal; spatially unresolved intensity inhomogeneities may also influence the observed relation.

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