Abstract
Observations of a sunspot in the Civ line at 1548 Å formed in the transition region have been analyzed to obtain the time variations and/or mean values of the velocity, intensity, longitudinal magnetic field, and line width. Oscillations with periods between approximately 110 and 200 s are observed only over the umbra where the transition region magnetic field is highest and the line width is smallest. When periodic intensity variations occur at the same frequency as the velocity oscillations, the peak intensities occur slightly before the maximum upward motions. No periodic variations in the transition region magnetic field have been detected. Scatter diagrams are presented which show possible relationships between the flow velocity, emission line intensity, line width, and transition region magnetic field.
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Henze, W., Tandberg-Hanssen, E., Reichmann, E.J. et al. SMM/UVSP observations of the distribution of transition region oscillations and other properties in a sunspot. Sol Phys 91, 33–44 (1984). https://doi.org/10.1007/BF00213608
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DOI: https://doi.org/10.1007/BF00213608