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| Titel |
Heavy ion acceleration at parallel shocks |
| VerfasserIn |
V. L. Galinsky, V. I. Shevchenko |
| 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 ; 17, no. 6 ; Nr. 17, no. 6 (2010-11-22), S.663-671 |
| Datensatznummer |
250013756
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| Publikation (Nr.) |
 copernicus.org/npg-17-663-2010.pdf |
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| Zusammenfassung |
| A study of alpha particle acceleration at parallel shock due to an
interaction with Alfvén waves self-consistently excited in both upstream
and downstream regions was conducted using a scale-separation model (Galinsky
and Shevchenko, 2000, 2007). The model uses conservation laws and resonance
conditions to find where waves will be generated or damped and hence where
particles will be pitch-angle scattered. It considers the total distribution
function (for the bulk plasma and high energy tail), so no standard
assumptions (e.g. seed populations, or some ad-hoc escape rate of
accelerated particles) are required. The heavy ion scattering on
hydromagnetic turbulence generated by both protons and ions themselves is
considered. The contribution of alpha particles to turbulence generation is
important because of their relatively large mass-loading parameter
Pα=nαmα/npmp (mp, np
and mα, nα are proton and alpha particle mass and density)
that defines efficiency of wave excitation. The energy spectra of alpha
particles are found and compared with those obtained in test particle
approximation. |
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