Latitudinal Variations of Line-of-Sight Velocity Oscillations in the Photosphere, Chromosphere and Prominences

By studying time variations in line-of-sight velocity in prominences, we found that the velocity oscillations with periods over 40 min have a reasonably well-marked dependence of the period length on the heliolatitude. Simultaneous observations of line-of-sight velocities in the photosphere and chromosphere showed that quasi-hourly oscillation periods at these levels of the solar atmosphere and in prominences have a similar latitudinal behaviour. Thus, the photosphere, chromosphere and prominences should be regarded as a unified oscillatory system.