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

Oka M. | Zendy; Terasawa T. | Zendy; Noda H. | Zendy; Saito Y. | Zendy; Mukai T. | Zendy

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

Author(s) -

Oka M.,

Terasawa T.,

Noda H.,

Saito Y.,

Mukai T.

Publication year - 2002

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/2002gl015111

Subject(s) - physics , torus , helium , pickup , ion , scattering , magnetic field , interplanetary spaceflight , distribution (mathematics) , atomic physics , pitch angle , astrophysics , computational physics , plasma , astronomy , nuclear physics , optics , solar wind , geometry , mathematics , quantum mechanics , artificial intelligence , computer science , image (mathematics) , mathematical analysis

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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