Bursts of relativistic electrons in magnetopause and in outer radiation belt

Details Bursts of relativistic electrons in magnetopause and in outer radiation belt Bursts of relativistic electrons in magnetopause and in outer radiation belt

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985rpspr....q..24b&link_type=abstract

In its USSR Rept.: Space (JPRS-USP-85-004) p 24 (SEE N85-26772 16-12) Transl. into ENGLISH from Geomagn. i Aeron. (Moscow), v

Physics

Magnetopause, Outer Radiation Belt, Relativistic Electron Beams, Solar Activity Effects, Electron Energy, Solar Wind

Scientific paper

Increases in the intensity of relativistic electrons are observed in the Earth's outer radiation belt. Information was collected from simultaneous observations of fluxes of relativistic electrons in the orbit of a geostationary satellite and near the magnetopause. During 1977 to 1979 more than 10 such events were observed; all were preceded by an increase in solar wind velocity. The data on increases in the density of relativistic electrons near the magnetopause and in the outer radiation belt indicate a close interrelationship between these two phenomena and solar wind velocity. The presence of a layer of shear flow of plasma near the magnetopause indicates that the origin of relativistic electrons may be caused by the process of their frictional acceleration in the layer. Electrons, accelerated near the magnetopause, due to scatterings can enter the region of quasicapture in the tail of the geomagnetosphere where they experience drift motion across the tail and also a process of radial diffusion, as a result of which the electrons penetrate into the radiation belts. The presence of relativistic electrons near the magnetopause may be explained by the frictional process of their acceleration in the layer of shear flow of solar wind plasma adjacent to the magnetopause.

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