Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm32a..09g&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM32A-09
Physics
2720 Energetic Particles, Trapped, 2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2772 Plasma Waves And Instabilities
Scientific paper
A theoretical analysis is made of the nonlinear electrostatic waves from the coupled plasma equations for a magnetized plasma, which yield generalized BGK-like equations for trapped-particle distributions that produce this structure in the guiding-center approximation. A conditional requirement is found for electron trapping, and the amount of trapping decreases as the angle with respect to the magnetic field increases, often ceasing at a critical finite angle. The results are examined for the special cases: (1) the case for near-Earth observation of BEN in the plasma mantle and recently reported from POLAR [Grabbe and Menietti, 2002], and (2) cases further out in the magnetotail such as observed on ISEE-1 [Grabbe, 1989]. The BEN data in case (1) show the presence of a fairly constant level of turbulence propagating obliquly to the magnetic field throughout these regions, and interesting new solitary structures confined narrowly to the source region. These solitary waves have definite structure both parallel and perpendicular to the magnetic field, and have differences from the solitary structures observed on Geotail further out in the magnetotail. The BEN data in case (2) suggests solitary waves are highly field-aligned. The theory strongly supports the conclusion that trapping can occur over a finite angle span because of the large magnetic field in the near-Earth case, but trapping is confined to close alignment with the magnetic field at distances sufficiently far out in the magnetotail.
Grabbe Crockett L.
Menietti Douglas J.
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