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Evidence for strong pitch-angle diffusion within the polar cusps

: Lehmann, H.-R.; Treumann, R.

Nature. Physical science 239 (1972), No.96, pp.143-145
ISSN: 0300-8746
Journal Article
Fraunhofer HHI ()
diffusion; magnetosphere; polar cusps; solar wind plasma; dayside magnetopause; maximum tangential gradient drift velocity; strong pitch angle diffusion; zero lamor radius chapman ferraro theory

The authors propose that the magnetosheath plasma enters the magnetosphere along the zones of maximum tangential gradient drift velocity, thereby identifying them with the polar cusps. Then some of the characteristics of the observed particle population within the polar cusps can be explained if one further assumes that the inward drift motion of the particles couples to strong pitch-angle diffusion.