Physics – Plasma Physics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29p..51g&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 16, pp. 51-1, CiteID 1804, DOI 10.1029/2002GL015265
Physics
Plasma Physics
6
Space Plasma Physics: Electrostatic Structures, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Nonlinear Phenomena
Scientific paper
A theoretical analysis of nonlinear electrostatic waves using coupled equations for a magnetized plasma yields a generalized BGK-like equation for trapped-particle distributions that produce these structures in the guiding-center approximation. A conditional requirement is found for electron trapping, and the amount of trapping decreases as the angle of the electric field relative to the backgrounnd magnetic field increases, ceasing at a critical finite angle. The results are applied to broadband electrostatic waves (BEN) in the magnetail. For BEN, trapping can occur over larger angles in the near-Earth case because of the large magnetic field there, whereas trapping is confined to close alignment with the magnetic field further out (e.g., under 20° at distances out 13 RE and above), and strongly supports the conclusion that in cases further out into the magnetotail that solitary waves are highly field-aligned.
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