5-min oscillations in the wings and bisectors of solar photospheric Fe I lines
Abstract
Former observations carried out at the center of the solar disk on three Fe I photospheric lines have shown that, during the 5-min oscillation, the bisector and the line flanks show an oscillation amplitude decreasing in a different way from the line core to the continuum. New observations, obtained in a magnetically insensitive line, in and outside the disk center, confirm the previous findings. From these and the former measurements it follows that the ratio between the Vrms of the blue and the red flanks in the observed lines depends on the height in the photosphere. This result may be qualitatively interpreted as due to the coupling of the velocity and brightness oscillations in the 5-min waves, and its height dependence as due to a phase effect.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 1987
- Bibcode:
- 1987A&A...173..161C
- Keywords:
-
- Iron;
- Line Shape;
- Photosphere;
- Solar Atmosphere;
- Solar Oscillations;
- Power Spectra;
- Solar Magnetic Field;
- Vertical Distribution;
- Solar Physics