Abstract
It is a well-established fact that the Mn I 539.47 nm line exhibits significant cycle dependence similar to lines arising in the chromosphere which are affected by non-thermal heating in the chromospheric plages. Among these lines the case of the Mn I 539.47 nm line seems unique. It is of photospheric origin on the basis of theoretical calculations but its cyclic dependence hints at a chromospheric nature. The present work provides further evidence to both connections. The line exhibits asymmetry features and a center-to-limb variation as though influenced by the photospheric granulation. On the other hand an enhancement of the central intensity has been detected in a well identifiable Ca plage area. The line seems to be a promising candidate as an irradiance variation indicator.
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Vince, I., Vince, O., LudmÁNy, A. et al. The Mn I 539.47 nm Line Variation in Solar Active Regions. Sol Phys 229, 273–285 (2005). https://doi.org/10.1007/s11207-005-8109-1
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DOI: https://doi.org/10.1007/s11207-005-8109-1