Random Remarks on Solar Hydrodynamics

This is not a review of the literature on solar hydrodynamics, but a discussion of just a few of the Interesting aspects of the subject. It is neither comprehensive, coherent nor well balanced. It concentrates on some of the questions that have been raised recently by new observations and have not yet received much attention, and particularly on topics that were raised at the recent General Assembly of the IAU. Subjects that have been reviewed in the past, such as the propagation of waves in the solar atmosphere and the structure of the solar wind, are avoided. Magneto-hydrodynamics is hardly mentioned at all.