This report shows, in detail, how the geomagnetic field interacts with the particle flux of the radiation belts to create a hazard to spacecraft and humans in near-Earth orbit. It illustrates the geometry of the geomagnetic field lines, especially around the area where the field strength is anomalously low in the South Atlantic Ocean. It discusses how the field will probably change in the future and the consequences that may have on hazards in near space.Heirtzler, J. R.Goddard Space Flight CenterGEOMAGNETISM; FIELD STRENGTH; FLUX (RATE); RADIATION BELTS; HAZARDS; EARTH ORBITAL ENVIRONMENTS...