‘Torus’ distribution of interstellar helium pickup ions: Direct observation

@inproceedings{Oka2002TorusDO,
  title={‘Torus’ distribution of interstellar helium pickup ions: Direct observation},
  author={M Oka and Toshio Terasawa and Hirotomo Noda and Yoshifumi Saito and Toshiharu Mukai},
  year={2002}
}
[1] 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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