Observations of ion velocity space holes associated with magnetic field fluctuations in the plasma sheet

Details Observations of ion velocity space holes associated with magnetic field fluctuations in the plasma sheet Observations of ion velocity space holes associated with magnetic field fluctuations in the plasma sheet

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm11a1167l&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM11A-1167

Other

7827 Kinetic And Mhd Theory, 2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2764 Plasma Sheet

Scientific paper

During geomagnetically active periods, magnetic field fluctuations are frequently observed. We present Cluster ion observations obtained in the near-Earth magnetotail from 15 to 20 Re. When field fluctuations are prominent, ion distributions become irregular. In particular, holes appear in ion velocity space distributions in the tailward direction. On the other hand, ions moving in the Earthward direction are accelerated and form beam-like distributions. The holes in velocity space are gyrophase dependent and suggest a sink of particles nearby the spacecraft. The directions of ion holes and beam-like distributions are quite steady even though magnetic field direction is changing. This results in high anisotropy in V⊥, which yields large velocity moments perpendicular to the magnetic field. The presence of large ∂ B/B suggests that a temporal mechanism (for example, scattering by waves) plays a role in the formation of the gyrophase-dependent holes and beam-like distributions. Possible mechamisms responsible for these observations will be investigated.

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