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| Titel |
A solution to the cosmic ray anisotropy problem |
| VerfasserIn |
P. Mertsch, S. Funk |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2199-3955
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| Digitales Dokument |
URL |
| Erschienen |
In: ASTRA Proceedings ; 2, no. 2 ; Nr. 2, no. 2 (2015-10-08), S.51-55 |
| Datensatznummer |
250115172
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| Publikation (Nr.) |
 copernicus.org/ap-2-51-2015.pdf |
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| Zusammenfassung |
| Observations of the cosmic ray (CR) anisotropy are widely advertised as a
means of finding nearby sources. This idea has recently gained currency after
the discovery of a rise in the positron fraction and is the goal of current
experimental efforts, e.g., with AMS-02 on the International Space Station.
Yet, even the anisotropy observed for hadronic CRs is not
understood, in the sense that isotropic diffusion models overpredict
the dipole anisotropy in the TeV–PeV range by almost two orders of
magnitude. Here, we consider two additional effects normally not considered
in isotropic diffusion models: anisotropic diffusion due to the presence of a
background magnetic field and intermittency effects of the turbulent magnetic
fields. We numerically explore these effect by tracking test-particles
through individual realisations of the turbulent field. We conclude that a
large misalignment between the CR gradient and the background field can
explain the observed low level of anisotropy. |
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