Low-energy ion pitch angle distributions in the outer magnetosphere - Ion zipper distributions

Details Low-energy ion pitch angle distributions in the outer magnetosphere - Ion zipper distributions Low-energy ion pitch angle distributions in the outer magnetosphere - Ion zipper distributions

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.3375f&link_type=abstract

Journal of Geophysical Research, vol. 86, May 1, 1981, p. 3375-3382.

Physics

48

Angular Distribution, Geomagnetism, Ion Distribution, Magnetospheric Ion Density, Particle Energy, Auroras, Diurnal Variations, Ion Injection, Particle Flux Density, Pitch (Inclination), Plasma Layers, Satellite-Borne Instruments, Spectral Energy Distribution

Scientific paper

Ion pitch angle distributions, measured in a near-synchronous orbit, are predominantly field aligned at low energies and predominantly peaked perpendicular to the magnetic field at higher energies. The transition from field-aligned fluxes to fluxes peaked predominantly perpendicular to the magnetic field occurs over a very narrow energy range. These ion distributions have been observed at all local times between 5.3 and 7.8 earth radii. This transition energy correlates with the deep minimum observed in the ion spectra. There is no apparent correlation between the ion transition energy and magnetic local time, L, Kp, or Dst. However, the transition energy does respond to observed particle injections. The transition energy decreases prior to injection, increases abruptly at injection by as much as 10-20 keV, and then decreases slowly after injection. Fresh low-energy ions are supplied at injection and decrease in intensity over several hours to instrument threshold level.

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