Physics – Plasma Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1013c&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A1, pp. SSH 3-1, CiteID 1013, DOI 10.1029/2001JA000160
Physics
Plasma Physics
1
Space Plasma Physics: Wave/Particle Interactions, Space Plasma Physics: Numerical Simulation Studies, Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Plasma Sheet
Scientific paper
Nongyrotropic plasma distribution functions can be formed in regions of space where guiding center motion breaks down as a result of strongly curved and weak ambient magnetic fields. Such are the conditions near the current sheet in the Earth's middle and distant magnetotail, where observations of nongyrotropic ion distributions have been made [Frank et al., 1994]. Here a systematic parameter study of nongyrotropic proton distributions using electromagnetic hybrid simulations is made. We model the observed nongyrotropic distributions by removing a number of arc length segments from a cold ring distribution and find significant differences with the results of simulations that initially have a gyrotropic ring distribution. Model nongyrotropic distributions with initially small perpendicular thermalization produce growing fluctuations that diffuse the ions into a stable Maxwellian-like distribution within a few proton gyro periods. The growing waves produced by nongyrotropic distributions are similar to the electromagnetic proton cyclotron waves produced by a gyrotropic proton ring distribution in that they propagate parallel to the background magnetic field and occur at frequencies on the order of the proton gyrofrequency. The maximum energy of the fluctuating magnetic field increases as the initial proton distribution is made more nongyrotropic, that is, more highly bunched in perpendicular velocity space. This increase can be as much as twice the energy produced in the gyrotropic case.
Ashour-Abdalla Maha
Convery Patrick D.
Richard Robert L.
Schriver David
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