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| Titel |
Effects of cold electron number density variation on whistler-mode wave growth |
| VerfasserIn |
R. Tang, D. Summers, X. Deng |
| 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 ; 32, no. 7 ; Nr. 32, no. 7 (2014-07-31), S.889-898 |
| Datensatznummer |
250121088
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| Publikation (Nr.) |
 copernicus.org/angeo-32-889-2014.pdf |
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| Zusammenfassung |
| We examine how the growth of magnetospheric whistler-mode waves depends on
the cold (background) electron number density N0. The analysis is
carried out by varying the cold-plasma parameter a = (electron gyrofrequency)2/(electron plasma frequency)2
which is proportional
to 1/N0. For given values of the thermal anisotropy AT and the
ratio Nh/N0, where Nh is the hot (energetic) electron number
density, we find that, as N0 decreases, the maximum values of the linear
and nonlinear growth rates decrease and the threshold wave amplitude for
nonlinear growth increases. Generally, as N0 decreases, the region of
(Nh/N0, AT)-parameter space in which nonlinear wave growth can
occur becomes more limited; that is, as N0 decreases, the parameter region
permitting nonlinear wave growth shifts to the top right of (Nh/N0,
AT) space characterized by larger Nh/N0 values and larger
AT values. The results have implications for choosing input parameters
for full-scale particle simulations and also in the analysis of whistler-mode
chorus data. |
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