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| Titel |
Effect of ion beam on electromagnetic ion cyclotron instability in hot anisotropic plasma-particle aspect analysis |
| VerfasserIn |
S. Patel, P. Varma, M. S. Tiwari, N. Shukla |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 8 ; Nr. 29, no. 8 (2011-08-30), S.1469-1478 |
| Datensatznummer |
250017079
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1469-2011.pdf |
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| Zusammenfassung |
| Using the general loss-cone distribution function electromagnetic ion
cyclotron (EMIC) instability affected by up going ion beam has been studied
by investigating the trajectories of charged particles. The plasma
consisting of resonant and non-resonant particles has been considered. It is
assumed that the resonant particles participate in energy exchange with the
wave, whereas non-resonant particles support the oscillatory motion of the
wave. The effect of ion beam velocity on the dispersion relation, growth
rate, parallel and perpendicular resonant energy of the EMIC wave with
general loss-cone distribution function in hot anisotropic plasma is
described by particle aspect approach. The effect of beam anisotropy and
beam density on electromagnetic ion cyclotron instabilities is investigated.
Growth length is derived for EMIC waves in hot anisotropic plasma. It is
found that the effect of the ion beam is to reduce the energy of
transversely heated ions, whereas the thermal anisotropy of the background
plasma acts as a source of free energy for the EMIC wave and enhances the
growth rate. It is observed that ion beam velocity opposite to the wave
propagation and its density reduces the growth rate and enhance the
reduction in perpendicularly heated ions energy. The effect of ion beam
anisotropy on EMIC wave is also discussed. These results are determined for
auroral acceleration region. It is also found that the EMIC wave emissions
occur by extracting energy of perpendicularly heated ions in the presence of
an up flowing ion beam. |
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