Physics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1525w&link_type=abstract
Journal of Geophysical Research, vol. 82, Apr. 1, 1977, p. 1525-1531.
Physics
33
Collisionless Plasmas, Earth Magnetosphere, Electric Fields, Particle Motion, Particle Trajectories, Distribution Functions, Magnetic Moments, Particle Density (Concentration), Relativistic Effects, Steady State, Velocity Distribution
Scientific paper
The presence of a parallel electric field in the magnetosphere should be apparent through its effect on particles. An analysis is made of particle trajectories in phase space for a steady state collisionless plasma. The analysis utilizes the concepts of distribution function, total energy, and magnetic moment because all three quantities are conserved in a steady state situation in the absence of collisions. Two methods are presented for using particle data to gain information on the potential distribution. The first method involves the use of measurements of both ion and electron distribution functions and invokes the principle of quasi-neutrality. The second method involves the observation of discontinuities in velocity space which can be interpreted in terms of the effect of the electric field on the apparent loss or source cone.
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