Physics – Plasma Physics
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30vssc4b&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 22, pp. SSC 4-1, CiteID 2148, DOI 10.1029/2003GL018491
Physics
Plasma Physics
27
Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Electric Fields (2411), Space Plasma Physics: Electrostatic Structures
Scientific paper
FAST observations of Debye-length-scale potential structures are ubiquitous in the auroral return current region of the magnetosphere. We show that the 3D shape of these fast-moving coherent structures can be correctly reproduced with a nonlinear fluid model of a 3D electron-acoustic beam soliton. This model describes the early stage of the nonlinear beam-plasma instability which takes place on the high-potential side of an electrostatic potential ramp, where cold ionospheric electrons are accelerated up the magnetic field lines by a localized DC parallel electric field. At FAST altitudes (below 4000 km), our model predicts spheroidal potential structures, while at higher altitudes we expect the solitary waves to be elongated across the magnetic field. This altitude-dependent scaling is in agreement with observations of solitary waves performed with POLAR over a wide range of altitudes.
Berthomier Mathieu
Carlson Carl W.
Muschietti L.
Pottelette Raymond
Roth Ilan
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