Velocity filter mechanism for ion bowl disributions (Bimodal conics)

Details Velocity filter mechanism for ion bowl disributions (Bimodal conics) Velocity filter mechanism for ion bowl disributions (Bimodal conics)

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.4513h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, April 1, 1986, p. 4513-4523.

Physics

23

Auroral Zones, Conics, Earth Magnetosphere, Electric Fields, Ion Distribution, Spatial Filtering, Liouville Theorem, Velocity

Scientific paper

The 'bowl-shaped' ion distributions in the high altitude auroral region observed by Klumpar et al. (1984) were originally interpreted as being due to a two-stage acceleration involving transverse ion heating and upward-aligned electric field acceleration. In this paper, it is shown that qualitatively similar bowl-shaped distributions can also be formed by transverse heating in a region of finite horizontal extent, followed by essentially adiabatic convective flow to the observation location. The latter stage contributes a velocity-filtering effect which produces some characteristics of the distributions observed. It is suggested it may be possible to use ion species observations to distinguish the mechanism proposed by Klumpar et al. from the alternative mechanism outlined in the present study.

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