Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.1202k&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #12.02; Bulletin of the American Astronomical Society, Vol. 24, p.747
Astronomy and Astrophysics
Astronomy
Scientific paper
We present measurements of a sunspot using unpolarized observations of the magnetically-sensitive (Lande g=3) Fe I line at lambda =1.5649 microns (6388.6 cm(-1) ). We compare the magnetic field profile from this fairly symmetric spot with model profiles. Splittings in this infrared line are nearly a factor of 3 greater than in a comparable visible line, since Zeeman splitting as a fraction of linewidth increases linearly with wavelength. The infrared is also less affected by stray light than the visible, because the intensity contrast is reduced, decreasing the effects of stray light, and because instrumental scatter is lower in the infrared. The combination of the magnetic and stray light advantages of the infrared and the recent availability of ``large'' infrared arrays has made possible more sensitive determinations of the magnetic field profile throughout sunspots. From observations of several sunspots, we find that the magnetic field strength, determined in the strong field regime, is not a smooth function of radius from spot center, and that single radial parameter models do not accurately describe the observed spots.
Köpp Gene
Kuhn Jeff
Lin Hainan
Rabin Doug
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