Influence of the 5-min oscillations on solar photospheric layers

I. Quiet region

¹ Institut für Physik, Institutsbereich Geophysik, Astrophysik und Meteorologie, Universitätsplatz 5, 8010 Graz, Austria e-mail: petra_odert@aon.at
² Astronomical Institute, Slovak Academy of Sciences, 05960 Tatranská Lomnica, Slovakia
³ Kiepenheuer-Institut für Sonnenphysik, Schöneckstrasse 6, 79104 Freiburg, Germany

Received: 17 March 2005
Accepted: 11 July 2005

Abstract

Time series of 1D spectrograms are used to study the influence of the 5-min oscillations on intensity and velocity fields of different layers of the quiet solar photosphere. We study the continuum intensity field along with intensity and corresponding velocity patterns of the mid and upper photosphere, obtained from two Fe lines. Oscillations seem to dominate the intensity and velocity fields of the higher atmospheric layers. Our results confirm the fast decay of the granular intensity structure with height. From correlations of temperature structures at three different photospheric levels we conclude that there are rapid changes of the structures in the lower photosphere, which are valid for the duration of the time series, while for the upper levels changes of the stuctures are fainter and show significant periodic character. The velocity pattern, on the other hand, shows a periodic propagation through the photosphere. The tests of the influence of seeing conditions on the data are considered.