The model provides a description of the magnetospheric electric field at ionospheric altitudes. It uses a set of simple functions that are dependent on Kp and Interplanetary Magnetic Field (IMF) Bx, By, and Bz components. The functions and empirical relations are based on previous models (Heelis, Volland) and on satellite and incoherent scatter radar observations. The Kp index controls the cross-tail potential, the diameter of the polar cap, and the extent of the equatorial fall-off region. For southward IMF the model field depends only on IMF By. For northward IMF, a pair of extra convection cells exists inside the polar cap.
Availability: FORTRAN program may be available from the authors.
J. J. Sojka, C. E. Rasmussen, and R. W. Schunk, An Interplanetary Magnetic Field Dependent Model of the Ionospheric Convection Electric Field, J. Geophys. Res. 91, 11281, 1986.
NASA Official: Dr. Robert McGuire, Head of the Space Physics Data Facility