Other
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.3513g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, April 1, 1989, p. 3513-3525. Research supported by the Los Alamos Nat
Other
36
Comets, Fluctuation Theory, Magnetohydrodynamic Stability, Plasma-Electromagnetic Interaction, Computerized Simulation, Hybrid Computers, Interplanetary Magnetic Fields, Ion Injection, Oxygen Ions
Scientific paper
A fully self-consistent computer simulation of homogeneous plasma was used to study electromagnetic instabilities and growing waves driven by injected ions in a model of the distant cometary environment; both relatively strong free-energy injection rates corresponding to exponential temporal growth of the fluctuating magnetic field energy density, as well as relatively weak injection rates which at early times correspond to the linear temporal growth of the same quantity, were considered. It was found that, in agreement with observations, the exponential growth regime corresponds to fluctuating field magnetic field energy density spectra with clear peaks at the oxygen ion cyclotron resonance wave number. On the other hand, spectra of the linear temporal growth regime exhibit less distinct peaks at shorter wavelengths; this absence of a clear spectral peak at the proton cyclogtron resonance frequency is similar to cometary observations.
Akimoto Kazuhiro
Gary Peter S.
Winske Dan
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