Other
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..667l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 6, p. 667-670
Other
14
Geomagnetism, Ion Distribution, Ions, Magnetosheath, Space Plasmas, Tensors, Ampte (Satellites), Anisotropy, Distribution Functions, Eigenvalues, Eigenvectors
Scientific paper
Active Magnetospheric Particle Tracer Explorer/Isothermal Remanent Magnetization (AMPTE/IRM) satellite data are used to examine characteristics of the ion pressure tensor in the earth's magnetosheath. The eigenvalues and principal axes of the pressure tensor are computed, and the directions of the principal axes are compared to the direction of the independently measured magnetic fiedl B. When the pressure tensor is anisotropic, as is usually the case in the magnetosheath, on of its eigenvalues is observed to be distinguishable from the other two, which are about equal to one another. Thus, the eigenvector associated with the distinguishable eigenvalue defines an axis of symmetry of the pressure tensor. The symmetry axis is generally not parallel to B. New features of the plasma distribution function are revealed by using the actual eigenvalues of the pressure tensor rather than the usual symbols to denote directions perpendicular and parallel to B.
LaBelle James
Lewis Ralph H.
Li Xinlin
Phan Tai-Duc
Treumann Rudolf A.
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