1. authors 14, 4,30,31133,75-39 et The presence
2. aXis 40-44 e t al. For a more accurate model, the known magnetic field data a t various points in space can be combined together by s herical harmonic expansion using a digital computer 4'. A t high altitudes, the field gets a£fected by the sun-spot activity and solar emissions. Using this simple model, many authors have determined the ma torque acting on a satellite 4''30 "4"'it a1.
3. considerable attention 33' 45-4 '. In modelling the