Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1613b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A2, p. 1613-1627.
Physics
7
Artificial Clouds, Cycloids, Magnetohydrodynamics, Plasma Diagnostics, Barium, Field Aligned Currents, Gyrofrequency, Magnetic Field Configurations
Scientific paper
The Combined Release and Radiation Effects Satellite (CRRES) spacecraft carried a number of barium thermite canisters for release into the upper atmosphere. The barium release labeled G-2 showed evidence of curved irregularities not aligned with the ambient magnetic field B. The newly discovered curved structures can be explained by a process called cycloid bunching. Cycloid bunching occurs when plasma is created by photoionization of a neutral cloud injected at high velocity perpendicular to B. If the injection velocity is much larger than the expansion speed of the cloud, the ion trail will form a cycloid that has irregularities spaced by the product of the perpendicular injection speed and the ion gyroperiod, Images of the solar-illuminated barium ions are compared with the results of a three-dimensional kinetic simulation. Cycloid bunching is shown to be responsible for the rapid generation of both curved and field-aligned irregularities in the CRRES G-2 experiment.
Bernhardt Paul A.
Huba Joseph D.
Pongratz Morris B.
Simons David J.
Wolcott John H.
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