Analyses On The Geometrical Structure Of The Magnetic Field Lines In Magnetosphere Based On Cluster Measurements

The geometrical structure of the magnetic field plays an im-portant role in the magnetosphere dynamics. Some former magnetic field models are reviewed in this paper. An analysis has been made to some regions of magnetosphere, including the Nightside, Cusp and Duskside. Applying the Method of Curvature Analysis to the magnetic field data measured by Cluster four satellites, the geometrical structure of MFLs (Magnetic Field Lines),including the curvature radius, directions of curvature and normal of the osculating planes of the MFLs have been investigated. Then we get the three dimentional structure of the regions through the results.