ИСТИНА

This paper describes the geometry and the behaviour of the Earth’s outer radiation belt polar boundary at the altitudes between 500 and 1000 km from the Earth surface in dependence of universal time and geomagnetic activity expressed by the Dst-index. The quantitative model which was built earlier for the Northern hemisphere in quiet conditions using the Coronas-Photon data measured in 2009 is upgraded in this work using Meteor-M 1 data for being usable during periods of disturbed magnetosphere. Both hemispheres are studied now. Observations are taking place at different altitudes. The outer radiation belt boundary is compared with the Polar Oval using data of NOAA POES for the period of time from September 2011 till July 2012.