Enhanced quasi stationary fluxes of energetic electrons to the pole of the polar boundary of the outer radiation belt and the possibility of the existence of local particle traps in the geomagnetic tailтезисы доклада
Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
Аннотация:Geomagnetic tail is the region in which intense processes of electron acceleration take place. Variations of electron fluxes with energies >200-300 keV at the polar boundary of the outer electron radiation belt are studied using data of low orbiting CORONAS-F and CORONAS-FOTON satellites. Results of observations demonstrate the existence of quasistationsry increases of fluxes of energetic electrons. The enhanced fluxes with very similar characteristics are observed at two or more consecutive orbits, i.e. have a life time of a few hours. The analysis of relative location of enhanced fluxes and auroral particle precipitations, measured simultaneously by the low orbiting METEOR-3M, METEOR-M and DMSP satellites, showed that the enhanced fluxes are located inside the auroral oval, i. e. poleward from the external boundary of the outer electron radiation belt. This fact was also confirmed comparing these fluxes with the auroral oval boundaries provided by the OVATION model of auroral precipitations. The nature of the observed events is discussed. Analysis of distribution of isolines Bmin=const, where Bmin is the minimal value of magnetic field at the magnetic field line, using different models of magnetic field, demonstrates the possibility of formation of local particle traps in the tail in which trajectories of energetic particles do not surround the Earth. It is shown that the formation of such local magnetic traps can help to explain the results of CORONAS-F and CORONAS-FOTON observations demonstrating the comparatively stable azimuthally asymmetric increases of fluxes of energetic electrons to the pole of the external boundary of the external electron radiation belt.