Force Balance and Substorm Effects in the Magnetotail and Nonguiding Center Motion and Substorm Effects in the Magnetotail

Most of the work carried out to date on this project is summarized in the enclosed reprints of two papers that were just published. The earlier paper that is also enclosed, Structure of the Magnetotail, by D. L. Larson and R. L. Kaufmann, was primarily intended to describe our Consistent Orbit Tracing (COT) technique and to show that the resulting magnetotail models were in good agreement with published experimental observations. The following are the most important results from the two new papers.