Sunspot vector magnetic fields and model umbral atmospheres

Details Sunspot vector magnetic fields and model umbral atmospheres Sunspot vector magnetic fields and model umbral atmospheres

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ncar.rept.....g&link_type=abstract

Final Report National Center for Atmospheric Research, Boulder, CO.

Computer Science

Atmospheric Models, Solar Atmosphere, Solar Magnetic Field, Stokes Theorem (Vector Calculus), Sunspots, Umbras, Absorption Spectra, Coronagraphs, Magnetic Flux, Polarimetry, Zeeman Effect

Scientific paper

The Stokes polarimeter of the High Altitude Observatory was used to observe a round, unipolar sunspot in three absorption lines and the nearby continua. Observations in the weak Zeeman triplet at 6302.50A wavelength are used to derive the vector magnetic field across the spot. Stokes profiles are used to probe the depth variation of the magnetic field and to obtain a model atmosphere for the umbra. A linear anticorrelation is found between the continuum intensity and the magnetic field strength. Model atmospheres determined at four locations in the umbra represent a significant improvement over the few existing umbral models in fitting the observed D2 line wings. A method of determining the longitudinal component of the B field as a function of depth is derived and tested with synthetic Stokes profiles.

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