Abstract
According to experimental data there are essential differences in the dynamics of trapped particles with magnetic drift periods more than and less than ≈ 1 h. The behaviour of the particles with fast drift (radiation belt particles) can be well described by the theory of diffusion resulting from sudden impulses. The considerably faster rate of transport of lower-energy particles implies the existence of low-frequency electric fields of large amplitude, the influence of which on energetic particles is reversible. The low-frequency fields are one of many interconnected effects, including particle variations, induction of ionospheric current systems, development of active forms of auroras, formation of D st, etc. A probable cause of these events is the appearance and evolution of a plasma ring asymmetric in longitude in the trapped radiation region. The asymmetry may be brought about both by particle injection into the magnetosphere and by penetration of an external electric field into the trapped radiation region. On the assumption that the ionosphere is connected with the magnetosphere by currents along the lines of force, ensuring quasineutrality, and that an electric potential develops when these currents close in the E-layer, it is possible to show that the electric fields and current systems DP-1 and DP-2 are the lowest modes of the system of eigenfunctions of the problem of relaxation of an asymmetric plasma cloud.
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Tverskoy, B.A. (1972). Electric Fields in the Magnetosphere and the Origin of Trapped Radiation. In: Dyer, E.R. (eds) Solar-Terrestrial Physics/1970. Astrophysics and Space Science Library, vol 29. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3693-5_32
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DOI: https://doi.org/10.1007/978-94-009-3693-5_32
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