Olson-Pfitzer Field Model 1974

Description

This is an analytical model of the Earth's magnetic field valid from the dayside subsolar magnetosphere to beyond lunar orbit in the nightside magnetotail. Only the quiet time magnetosphere is represented including the contributions from magnetopause, tail, and ring currents. The internal (core) field is represented by a fixed dipole. The field representation is given in Cartesian GMS coordinates using sixth-order expansions of power series and exponential terms. The 180 coefficients were determined by fitting to over 600 magnetometer measurements from OGO 3 and 5. Shortcomings of this model are the restriction to quiet conditions and the fact that the direction of the main dipole and the ring current is fixed (i.e., perpendicular to the Earth-Sun direction).