An. Babin et al., OBSERVATIONS OF MAGNETIC-FIELDS IN THE UPPER CHROMOSPHERE IN THE HE-ILINE LAMBDA-10830-ANGSTROM, Astronomy letters, 20(4), 1994, pp. 508-511
Techniques for the reduction of spectroscopic observations of sunspot
magnetic fields in the He I line lambda10830 angstrom and Si I line la
mbda10827 angstrom are described. The observations were conducted at t
he tower solar telescope using a spectrograph equipped with a CCD came
ra. The method makes it possible to determine the longitudinal magneti
c field in the chromosphere and to estimate the magnitude of the total
magnetic-field vector.