註釋 The interaction between a neutral stream of ionized solar corpuscles and a three-dimensional magnetic dipole representing the geomagnetic field is investigated. It is assumed that the stream is confined to the exterior and the magnetic field to the interior of a hollow, the boundary of which is defined by a thin current sheath. An approximate method of solution is applied, and results are presented for the coordinates of the trace of the boundary of the hollow in the meridian plane containing the sun-earth line and the dipole axis for several relative orientations. Results are also presented for the trace in the equatorial plane for the case in which the dipole axis is normal to the sun-earth line. The corresponding problem in two dimensions is also considered, and it is shown that the analogous approximate results are in good agreement with the results indicated by an exact solution of the same basic equations. 