Polarimetry and spectroscopy of a simple sunspot. IV. Umbral structures observed in FeI 1027nm

Details Polarimetry and spectroscopy of a simple sunspot. IV. Umbral structures observed in FeI 1027nm Polarimetry and spectroscopy of a simple sunspot. IV. Umbral structures observed in FeI 1027nm

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...290..649b&link_type=abstract

Astronomy and Astrophysics 290, 649-654 (1994)

Astronomy and Astrophysics

Astrophysics

8

Sun: Activity, Magnetic Fields, Sunspots

Scientific paper

Magnetic fields and velocities in bright umbral structures have been determined from long time sequences of high resolution Stokes-I spectra obtained with the near infrared FeI 1026.52nm line. This weak line is unblended in the umbra and has a triplet-like Zeeman pattern similar to a g_eff_=2.5 line. The umbral bright structures show velocity oscillations identical to those of the surrounding umbra. A bright structure with a size of 2 arcsec close to the center of the umbra shows a slightly lower magnetic field strength than its surroundings. This difference decreases whereas the structure becomes brighter during several hours of observations.

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