Heating of low energy electrons in the boundary layer at the interface between magnetosphere and magnetosheath

Details Heating of low energy electrons in the boundary layer at the interface between magnetosphere and magnetosheath Heating of low energy electrons in the boundary layer at the interface between magnetosphere and magnetosheath

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm12a..08t&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM12A-08

Physics

Plasma Physics

[7845] Space Plasma Physics / Particle Acceleration, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

When they cross the terrestrial magnetosheath (MS), the 4 Cluster spacecraft regularly observe magnetospheric (Msph) plasma incursions surrounded by a boundary layer (BL). This kind of region is known to be composed of an inner and an outer regions. Contrary to previous studies which distinguished these latter from the presence/absence of Msph particles, we show here that both of these regions contain not only an accelerated and/or heated MS plasma but also a diffusive high energy Msph population whose pitch angle distribution depends on the region of the BL crossed. Moreover, in the case presented here, a third population characterized by a lower energy, coming from the ionosphere, was also detected but on the inside edge of the Msph boundary. Its particular structure as a function of pitch angle suggests a heating mechanism different from the one existing in the boundary layer yet located nearby. From the electron, E and B fields and wave data, we show how the plasma is structured within the magnetospheric domain and demonstrate that the heating region of the ionospheric electrons is located in the close vicinity of the mirror point of the high energy Msph electrons.

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