Physics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.2175g&link_type=abstract
Journal of Geophysical Research, vol. 86, Apr. 1, 1981, p. 2175-2182.
Physics
17
Auroral Zones, Electric Fields, Electron Precipitation, Magnetically Trapped Particles, Particle Acceleration, Data Acquisition, Electron Distribution, Equipotentials, Ion Motion, Magnetic Mirrors, Plasma Diagnostics
Scientific paper
The use of electron data to probe the structure of parallel electrostatic fields is studied. Low-energy electrons can be trapped between their magnetic mirror points below an observer and the upward directed electric field above. The shape of the trapping region in phase space gives information about the field structure. Equivalent potential diagrams and plots of phase space boundaries in (mu, E) space are used both to explain the results and to demonstrate the utility of these formalisms for studying particle motion in time-independent electric fields. A comparison of theoretical boundaries in (nu-parallel, nu-perpendicular) space with S3-3 data shows that it is difficult to determine the shape of the low-energy trapping boundary with present particle experiments.
Greenspan Marian E.
Silevitch Michael B.
Whipple Elden C. Jr.
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