Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm13c..07k&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM13C-07
Physics
2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped, 2731 Magnetosphere: Outer, 2748 Magnetotail Boundary Layers, 2764 Plasma Sheet
Scientific paper
With every new spacecraft traversing the plasma sheet boundary layer (PSBL) new properties of ion beams are identified. Clusters multipoint measurement capability allowed us to study in great detail the intricate nature of energy-dispersed ions (at 4-5 Re) which were substructured into several (up to four) beamlets with a quasi-periodicity of 1-3 min. New ion properties could be identified associated with the energy range, the spatial extent and the energy dispersion types. The ion beamlet injections occurred at distances larger than 50 Re in the tail and showed both temporal (time-of-flight) and spatial effects. We propose an injection scenario (impulsive and recurrent) in the distant current sheet to understand the spatio-temporal history of these energy-dispersed ion beamlets. Furthermore, we show evidence that the beamlets can undergo several bounces in the tail while staying coherent. These results add significantly to the known realm of plasma sheet dynamics.
Amata Ermanno
Bosqued J.
Dandouras Iannis
Keiling Andreas
Klecker Berndt
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