Abstract
The physical and chemical processes responsible for cometary ionospheres are now beginning to be understood, due to comparisons between theoretical results and recently obtained in situ observations of the ionospheric plasma and magnetic field of comet Halley. The contact surface which separates outflowing cometary plasma from solar wind controlled cometary plasma can be explained in terms of a balance between the magnetic pressure gradient force and ion-neutral drag. An analytic expression for the magnetic field in the vicinity of the contact surface is given in this paper.
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