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Titel |
Proton acceleration in the Earth |
VerfasserIn |
A. Greco, S. Perri, G. Zimbardo, 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 |
250028961
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Zusammenfassung |
Ion beams with energies of the order of several tens of keV are frequently observed in the
Earth’s magnetotail. Here we consider two possible acceleration mechanisms, the cross tail
electric field Ey and the stochastic acceleration due to the electromagnetic fluctuations
present in the magnetotail. A test particle simulation has been performed in order to
reproduce the interaction between charged particles and electromagnetic fluctuations and the
constant dawn-dusk electric field, Ey, in the magnetotail current sheet. Electromagnetic
perturbations are generated by random oscillating “clouds" moving in the x-y plane. Protons
are accelerated via a stochastic Fermi-like process and, by varying the features
of the electromagnetic fluctuations, along with the value of the normal magnetic
component and other physical parameters, we can explain a range of energetic ion
observations. |
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