`Torus' distribution of interstellar helium pickup ions: Direct observation

Details `Torus' distribution of interstellar helium pickup ions: Direct observation `Torus' distribution of interstellar helium pickup ions: Direct observation

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29l..54o&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 12, pp. 54-1, CiteID 1612, DOI 10.1029/2002GL015111

Physics

Plasma Physics

6

Interplanetary Physics: Pickup Ions, Space Plasma Physics: Ionization Processes, Space Plasma Physics: Transport Processes, Interplanetary Physics: Mhd Waves And Turbulence

Scientific paper

A`torus'-like velocity distribution of the helium pickup ions has been detected in interplanetary space by GEOTAIL. A statistical survey shows that the observation probability of the `torus' distribution amounts to nearly 20% and that the distribution pattern depends on the local magnetic field directions and turbulence levels. These results support the recent finding of a low pitch angle scattering rate and a large mean free path.

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