Evolution of the cosmic ray anisotropy above 10^{14} eV
| Autor: | Aglietta, M., Alekseenko, V. V., Alessandro, B., Antonioli, P., Arneodo, F., Bergamasco, L., Bertaina, M., Bonino, R., Castellina, A., Chiavassa, A., Piazzoli, B. D'Ettorre, Di Sciascio, G., Fulgione, W., Galeotti, P., Ghia, P. L., Iacovacci, M., Mannocchi, G., Morello, C., Navarra, G., Saavedra, O., Stamerra, A., Trinchero, G. C., Valchierotti, S., Vallania, P., Vernetto, S., Vigorito, C. |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Astrophys.J.Lett.692:L130-L133,2009 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0004-637X/692/2/L130 |
| Popis: | The amplitude and phase of the cosmic ray anisotropy are well established experimentally between 10^{11} eV and 10^{14} eV. The study of their evolution into the energy region 10^{14}-10^{16} eV can provide a significant tool for the understanding of the steepening ("knee") of the primary spectrum. In this letter we extend the EAS-TOP measurement performed at E_0 around 10^{14} eV, to higher energies by using the full data set (8 years of data taking). Results derived at about 10^{14} and 4x10^{14} eV are compared and discussed. Hints of increasing amplitude and change of phase above 10^{14} eV are reported. The significance of the observation for the understanding of cosmic ray propagation is discussed. Comment: 4 pages, 3 figures, accepted for publication on ApJ Letters |
| Databáze: | arXiv |
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