Polarimetry and spectroscopy of a simple sunspot. 2: On the height and temperature dependence of the magnetic field

Details Polarimetry and spectroscopy of a simple sunspot. 2: On the height and temperature dependence of the magnetic field Polarimetry and spectroscopy of a simple sunspot. 2: On the height and temperature dependence of the magnetic field

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279..243b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 1, p. 243-250

Astronomy and Astrophysics

Astrophysics

36

Brightness Temperature, Height, Infrared Spectra, Line Spectra, Penumbras, Photosphere, Solar Magnetic Field, Sunspots, Temperature Dependence, Umbras, Astronomical Polarimetry, Astronomical Spectroscopy, Infrared Spectroscopy, Near Infrared Radiation

Scientific paper

We have observed a fairly regular sunspot located near disk center and have taken series of spectrograms in three different photospheric lines. The magnetic field strength across the spot has been measured in different heights of the sunspot photosphere and shows a change in slope at the umbra-penumbra boundary. The line depression contribution functions have been computed in order to obtain the height of formation of the spectral lines used in this analysis. Along the line-of-sight, we find an upward decrease of the field strength of 2.5 to 3 G/km in the penumbra and the adjacent outer part of the umbra. A relation has been deduced between the magnetic field and the brightness temperature measured across the sunspot which is strongly nonlinear and shows pronounced differences between the umbra and the penumbra.

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