On depth-dependence of photospheric oscillations |
| |
| Authors: | Koch A Küveler G Schröter E H |
| |
| Institution: | (1) Universitätssternwarte, Göttingen, Germany;(2) Kiepenheuer-Institut für Sonnenphysik, Freiburg, Germany |
| |
| Abstract: | We report on results from photographic observations of photospheric oscillations as a function of depth. Using rms-values and power-spectra from shifts of entire line-profiles, we find qualitatively an increase of the velocity-amplitude with increasing height. We get more quantitative informations by comparing measured asymmetries of line-profiles with calculated ones derived from Voigt-functions containing a depth dependent velocity-field.We find the scale-height H
0 of photospheric velocity oscillations to be 930±100 km. This result is to be compared with H
0 = 1100±200 km obtained by Canfield (1976), who used velocity weighting functions of the line centres.Further, we show that a general observed line asymmetry of medium strong lines (c-shape) does not depend on the phase of oscillations.Mitt. aus dem Kiepenheuer-Institut Nr. 178. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
