Interesting lines in the infrared solar spectrum. III. A polarimetric survey between 1.05 and 2.50 μm.

Details Interesting lines in the infrared solar spectrum. III. A polarimetric survey between 1.05 and 2.50 μm. Interesting lines in the infrared solar spectrum. III. A polarimetric survey between 1.05 and 2.50 μm.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..113...91r&link_type=abstract

Astronomy and Astrophysics Supplement, v.113, p.91

Astronomy and Astrophysics

Astrophysics

26

Line: Identification, Line: Profiles, Sun: Faculae, Plages, Sun: Infrared, Sun: Magnetic Fields, Polarization, Sunspots

Scientific paper

We present a survey of Stokes I, V and Q in the near infrared spectral range between 1.05 and 2.50μm, based on Fourier transform spectrometer data obtained in a sunspot umbra and in an active region plage. We discuss the diagnostic potential of a number of lines for studying solar magnetic features. These include the Ti I multiplet near 22000A, the Fe I g=3 line at 15648.5A, He I 10830A, high excitation C I lines, as well as CO and CN lines. As an example, we provide the first estimate of the field strength gradient averaged over the height range covered by the photosphere and chromosphere. We also identify lines that show large Stokes V or Q amplitudes and analyze their profile asymmetries. In our J-band plage spectrum the Stokes V and Q profiles show an extremely large blue-red asymmetry, whose origin is not yet clear. As an incidental result we obtain the first measured value of the vertical gradient of the magnetic field strength in a plage. Averaged over approximately 1500-2000km it corresponds to roughly 0.6G/km.

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