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| Titel |
Ion motion in the current sheet with sheared magnetic field – Part 1: Quasi-adiabatic theory |
| VerfasserIn |
A. V. Artemyev, A. I. Neishtadt, L. M. Zelenyi |
| 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 ; 20, no. 1 ; Nr. 20, no. 1 (2013-02-21), S.163-178 |
| Datensatznummer |
250017737
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| Publikation (Nr.) |
 copernicus.org/npg-20-163-2013.pdf |
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| Zusammenfassung |
| We present a theory of trapped ion motion in the magnetotail current sheet
with a constant dawn–dusk component of the magnetic field. Particle
trajectories are described analytically using the quasi-adiabatic invariant
corresponding to averaging of fast oscillations around the tangential
component of the magnetic field. We consider particle dynamics in the
quasi-adiabatic approximation and demonstrate that the principal role is
played by large (so called geometrical) jumps of the quasi-adiabatic
invariant. These jumps appear due to the current sheet asymmetry related to
the presence of the dawn–dusk magnetic field. The analytical description is
compared with results of numerical integration. We show that there are four
possible regimes of particle motion. Each regime is characterized by certain
ranges of values of the dawn–dusk magnetic field and particle energy. We find
the critical value of the dawn–dusk magnetic field, where jumps of the
quasi-adiabatic invariant vanish. |
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