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| Titel |
Theory of localized bipolar wave-structures and nonthermal particle distributions in the auroral ionosphere |
| VerfasserIn |
M. V. Goldman, M. M. Oppenheim, D. L. Newman |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 6, no. 3/4 ; Nr. 6, no. 3/4, S.221-228 |
| Datensatznummer |
250003227
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| Publikation (Nr.) |
 copernicus.org/npg-6-221-1999.pdf |
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| Zusammenfassung |
| Bipolar wave structures and nonthermal
particle distributions measured by the FAST satellite in regions of downward
current are interpreted in terms of the nonlinear evolution of a two-stream
instability. The instability results in holes, both in the electron distribution
in phase space and in the electron density in real space. The wave potential
energy, which traps the electrons, has a single minimum, and the associated
electric field is bipolar. The early bipolar structures are coherent over
hundreds of Debye lengths in the direction perpendicular to the magnetic field.
After thousands of plasma periods the perpendicular coherence is lost, the
structures break up, and electrostatic whistlers begin to dominate. Simulations
and preliminary analysis of this breakup and emission process are presented. |
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