Vertical Flows in a Quiescent Filament
Abstract
High resolution spectra of the H, and Ca II H and K lines were observed simultaneously for a quiescent filament on the solar disk on 27 July, 1974. The narrow absorption line profiles of the disk filament show asymmetries which give rise to differences in flow velocities derived from measurements of line center positions. The bi-sector at a higher intensity level of the three lines gives consistent values for vertical flow velocities. The velcities range from -1.7 to +2.7 km s -1, and mean value 0.5 km s -1, for H, and -1.9 to 2.5 km s -1, and mean value 0.3 km s -1, for the Ca II H and K lines.
- Publication:
-
IAU Colloq. 117: Dynamics of Quiescent Prominences
- Pub Date:
- 1990
- DOI:
- 10.1007/BFb0025640
- Bibcode:
- 1990LNP...363..262Y