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| Titel |
Characteristics of electrostatic solitary waves observed in the plasma sheet boundary: Statistical analyses |
| VerfasserIn |
H. Kojima, Y. Omura, H. Matsumoto, K. Miyaguti, T. Mukai |
| 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.179-186 |
| Datensatznummer |
250003222
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| Publikation (Nr.) |
 copernicus.org/npg-6-179-1999.pdf |
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| Zusammenfassung |
| We present the characteristics of the
Electrostatic Solitary Waves (ESW) observed by the Geotail spacecraft in the
plasma sheet boundary layer based on the statistical analyses. We also discuss
the results referring to a model of ESW generation due to electron beams, which
is proposed by computer simulations. In this generation model, the nonlinear
evolution of Langmuir waves excited by electron bump-on-tail instabilities leads
to formation of isolated electrostatic potential structures corresponding to
"electron hole" in the phase space. The statistical analyses of the
Geotail data, which we conducted under the assumption that polarity of ESW
potentials is positive, show that most of ESW propagate in the same direction of
electron beams, which are observed by the plasma instrument, simultaneously.
Further, we also find that the ESW potential energy is much smaller than the
background electron thermal energy and that the ESW potential widths are
typically shorter than 60 times of local electron Debye length when we assume
that the ESW potentials travel in the same velocity of electron beams. These
results are very consistent with the ESW generation model that the nonlinear
evolution of electron bump-on-tail instability leads to the formation of
electron holes in the phase space. |
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