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| Titel |
Electrostatic shock properties inferred from AKR fine structure |
| VerfasserIn |
R. Pottelette, R. A. Treumann, M. Berthomier, J. Jasperse |
| 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 ; 10, no. 1/2 ; Nr. 10, no. 1/2, S.87-92 |
| Datensatznummer |
250007823
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| Publikation (Nr.) |
 copernicus.org/npg-10-87-2003.pdf |
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| Zusammenfassung |
| The auroral
kilometric radiation (AKR) consists of a large number of fast drifting
elementary radiation events that have been interpreted as travelling
electron holes resulting from the nonlinear evolution of electron-acoustic
waves. The elementary radiation structures sometimes become reflected or
trapped in slowly drifting larger structures where the parallel electric
fields are located. These latter features have spectral frequency drifts
which can be interpreted in terms of the propagation of shock-like
disturbances along the auroral field line at velocities near the
ion-acoustic speed. The amplitude, speed, and shock width of such
localized ion-acoustic shocks are determined here in the fluid
approximation from the Sagdeev potential, assuming realistic plasma
parameters. It is emphasized that the electrostatic potentials of such
nonlinear structures contribute to auroral acceleration. |
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