The combined effects of hyperfine structure and Zeeman splitting have been calculated for the a6D½-z6D½ line of Mn I at wavelength 4070.28 Å, which is observed as a broad line in sunspot spectra. An effective Z factor is defined to represent the mean position of the strong components of the line for fields above 500 G. This Z factor might provide a method of monitoring sunspot magnetic fields.
© 1984 Optical Society of America
R. H. Garstang, "Hyperfine structure and the broadening of sunspot spectral lines," J. Opt. Soc. Am. B 1, 311-313 (1984)