Initial expansion phase of an artificially injected electron beam

Details Initial expansion phase of an artificially injected electron beam Initial expansion phase of an artificially injected electron beam

Apr 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22..633g&link_type=abstract

Planetary and Space Science, Volume 22, Issue 4, p. 633-636.

Physics

2

Scientific paper

We consider the expansion of an electron beam (E ~ 20 keV, I ~ 1 A) artificially injected into the magnetosphere at a high latitude (Λ ~ 60°). We show that, although the space charge effects play an important role during the initial phase of the expansion, it is the magnetic field at the place of the injection which governs the beam radius and the beam density. For an injection parallel to the magnetic field, the ratio between the beam kinetic energy density and the magnetic energy when the beam passes through the Equator, may reach important values (~ 2-5). However, taking into account possible beam instabilities could strongly modify this conclusion. Present address: Groupe de Recherches Ionosphériques, CNET, 92131 France.

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