Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..543r&link_type=abstract
Astronomy and Astrophysics, v.302, p.543
Astronomy and Astrophysics
Astrophysics
30
Sun: Magnetic Fields, Sun: Infrared, Sunspots
Scientific paper
We investigate the magnetic structure of an umbra and the light bridge it contains using spectra at 1.56μm. The magnetic field strength in the umbra reaches over 3500G on the first day of observation and 3200G on the second and third days, while the field strength in the light bridge is reduced by 1000-1400G relative to the nearby umbra. The magnetic vector is also found to be much more horizontal in the light bridge. There is evidence that the boundary between the strong and weak magnetic field is less than 1" wide, implying the presence of large currents there. At some locations a downflow of up to 1.5km/s is seen in the light bridge relative to the umbral material. Finally, we discuss the blending of the 1.5648μm line in sunspots and develop the depth of the OH 15650.7A line as a diagnostic of umbral temperatures.
Livingston Willam
Rueedi I.
Solanki Sami K.
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