Solar wind interaction with the geomagnetic field

The interaction of the solar wind with the geomagnetic field is a complicated physical phenomenon. This paper attempts to point out the various major effects involved directly in the interaction and to assess the degree to which the effects are, and are not, understood at the present time. It is a collection of my own thoughts, opinions, and prejudices on the solar wind interaction. I am looking forward to new results to be reported at this symposium, which, I hope, will render much of this review obsolete.