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| Titel |
Influence of the perpendicular electric field on ion beamlets in the magnetotail |
| VerfasserIn |
M. Dolgonosov, G. Zimbardo, A. Greco, L. Zelenyi |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027401
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| Zusammenfassung |
| Several studies, both experimental, analytical, and numerical, show that a substantial
electric field Ez perpendicular to the magnetotail current sheet can be found. This
electric field has a typical bipolar structure. It was expected that Ez electric field
could change condition for ions adiabatic acceleration in the magnetotail previously
obtained by Buechner and Zelenyi (JGR, V.94, 1989). We are going to present
analytical theory describing modification of resonant conditions under influence
of Ez. A test particle simulation also has been performed to compare simulation
results with analytical ones. We found that for both signs of Ez (pointing away and
towards the current sheet), the beamlet energies are slightly decreased for moderate
values of |Ez|, while the beamlets spread in energy and almost merge for larger
values of |Ez|. But this effect is much more marked for Ez pointing towards the
current sheet. In this case only one beamlet curve exists and all ion structures are
overlapped. This merging appears to be related to the formation of a nonlinear
potential well in the ion motion. Implications for beamlet observations are discussed. |
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