Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51a0791w&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM51A-0791
Other
2471 Plasma Waves And Instabilities, 2483 Wave/Particle Interactions, 2704 Auroral Phenomena (2407), 2712 Electric Fields (2411)
Scientific paper
Nonlinear evolution of electron beam-driven waves is studied by means of three-dimensional particle-in-cell (PIC) simulations using a parallel PIC code. The simulations reveal a variety of nonlinear waveforms in the form of solitary potential structures. They range from unipolar positive potential pulses like that of an electron hole to unipolar negative pulses and bipolar potential structures. Field structures observed from satellites are compared with those seen in the simulations. When the electron beam velocity is relatively small, the electron holes dominate the nonlinear behavior. For larger beam velocities, it is possible to generate the other waveforms as mentioned above. The unipolar positive potential pulses have been now detected by several satellites such as FAST, Polar and Geotail. The negative pulses were recently reported to be observed from Cluster. Structures in the electric field distributions and in electron and ion phase space for the nonlinear waveforms will be presented.
Singh Navinder
Wells Brendan
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