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| Titel |
The Local Bubble as a cosmic-ray isotropizer |
| VerfasserIn |
I. Gebauer, M. Weinreuter, S. Kunz, D. Gaggero |
| 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 (2015-07-31), S.1-3 |
| Datensatznummer |
250115163
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| Publikation (Nr.) |
 copernicus.org/ap-2-1-2015.pdf |
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| Zusammenfassung |
| The arrival directions of energetic positrons and electrons convey
fundamental information on their origin. PAMELA, and more recently AMS, have
measured an anomalous population of energetic positrons, which cannot be
explained in standard cosmic ray propagation models. Two possible sources
have been extensively discussed: astrophysical point sources, such as local
pulsars, and dark matter. In the first case an anisotropy in the flux of
energetic particles is expected. Reliable predictions of the level of
anisotropy need to account for the Sun's peculiar environment: the Sun
resides in the so-called Local Bubble, an underdense region, embedded in a
dense wall of molecular clouds. This structure is expected to act as an
efficient cosmic-ray isotropizer. Using realistic assumptions on the impact
of the Local Bubble on cosmic-ray diffusion, we demonstrate that the Local
Bubble can indeed dilute the directional information of energetic positrons
and electrons. |
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