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| Titel |
Low frequency waves in plasmas with spatially varying electron temperature |
| VerfasserIn |
P. Guio, S. Børve, H. L. Pécseli, J. Trulsen |
| 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 ; 18, no. 12 ; Nr. 18, no. 12, S.1613-1622 |
| Datensatznummer |
250014105
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| Publikation (Nr.) |
 copernicus.org/angeo-18-1613-2000.pdf |
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| Zusammenfassung |
Low frequency electrostatic waves are studied
in magnetized plasmas with an electron temperature which varies with position in
a direction perpendicular to the magnetic field. For wave frequencies below the
ion cyclotron frequency, the waves need not follow any definite dispersion
relation. Instead a band of phase velocities is allowed, with a range of
variation depending on the maximum and minimum values of the electron
temperature. Simple model equations are obtained for the general case which can
be solved to give the spatial variation of a harmonically time varying
potential. A simple analytical model for the phenomenon is presented and the
results are supported by numerical simulations carried out in a 2½-dimensional
particle-in-cell numerical simulation. We find that when the electron
temperature is striated along B0 and low frequency waves
(ω ≪ Ωci) are excited in this
environment, then the intensity of these low frequency waves will be striated in
a manner following the electron temperature striations. High frequency ion
acoustic waves (ω ≫ Ωci) will on the
other hand have a spatially more uniform intensity distribution.
Key words: Ionosphere (plasma temperature and density)
· Radio science (waves in plasma) · Space plasma physics (numerical simulation
studies) |
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