The source of the solar oscillations: magnetic or convective?

The origin of solar oscillations has not yet been clearly determined. The downflows due to convective rapid cooling at the surface have been invoked as a possible source. In this paper we investigate the properties of the source as inferred from the local analysis of the intensity-velocity phase differences. The same spatial and temporal characteristics of other observed events and their correlation with the Halpha bright points suggests downward plasma jets related to explosive chromospheric evaporation to be another possible candidate.