Physics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.4415g&link_type=abstract
(Upstream Wave and Particle Workshop, California Institute of Technology, Jet Propulsion Laboratory, Pasadena, CA, Apr. 15, 16,
Physics
59
Ion Beams, Plasma Diagnostics, Satellite Observation, Space Plasmas, Bow Waves, International Sun Earth Explorers, Ion Temperature, Maxwell-Boltzmann Density Function, Shock Waves
Scientific paper
The unexpected appearance of spin modulations in the fixed voltage electrostatic analyzer detectors on ISEE 1 and 2 has made it possible to study the plasma properties of the upstream ions in high time resolution. Using an isotropic flowing Maxwellian distribution to model the count rate modulations, estimates have been obtained of the local plasma temperature and three-dimensional flow velocity of the observed upstream ion population. It is found that in almost all of the observations of upstream particles there exist beam-like ions with temperatures in the range 5-80 eV. Their flow velocities cannot be ordered by E x B. This last point separates these observations from the previously reported reflected and diffuse populations of upstream ions. Mechanisms that can gyrophase bunch the ions reflected at the bow shock are discussed as a method of explaining the data.
Anderson Katharine A.
Gurgiolo Chris
Lin Chang-Shou
Lin Robert P.
Mauk Barry H.
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