Evolution of the cosmic-ray anisotropy above 1014 eV

M. Aglietta; V. V. Alekseenko; B. Alessandro; P. Antonioli; F. Arneodo; L. Bergamasco; M. Bertaina; R. Bonino; A. Castellina; A. Chiavassa; B. D'Ettorre Piazzoli; G. Di Sciascio; W. Fulgione; P. Galeotti; P. L. Ghia; M. Iacovacci; G. Mannocchi; C. Morello; G. Navarra; O. Saavedra; A. Stamerra; G. C. Trinchero; S. Valchierotti; P. Vallania; S. Vernetto; C. Vigorito

doi:10.1088/0004-637X/692/2/L130

Evolution of the cosmic-ray anisotropy above 10¹⁴ eV

M. Aglietta, V. V. Alekseenko, B. Alessandro, P. Antonioli, F. Arneodo, L. Bergamasco, M. Bertaina, R. Bonino, A. Castellina, A. Chiavassa, B. D'Ettorre Piazzoli, G. Di Sciascio, W. Fulgione, P. Galeotti, P. L. Ghia, M. Iacovacci, G. Mannocchi, C. Morello, G. Navarra, O. SaavedraA. Stamerra, G. C. Trinchero, S. Valchierotti, P. Vallania, S. Vernetto, C. Vigorito

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

The amplitude and phase of the cosmic-ray anisotropy are well established experimentally between 10¹¹ eV and 10¹⁴ eV. The study of their evolution in the energy region 10¹⁴-10¹⁶ 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 10¹⁴ eV to higher energies by using the full data set (eight years of data taking). Results derived at about 10¹⁴ and 4 × 10¹⁴ 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.

Original language	English (US)
Pages (from-to)	L130-L133
Journal	Astrophysical Journal
Volume	692
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/692/2/L130
State	Published - 2009

Keywords

Cosmic rays
Diffusion

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1088/0004-637X/692/2/L130

Cite this

Aglietta, M., Alekseenko, V. V., Alessandro, B., Antonioli, P., Arneodo, F., Bergamasco, L., Bertaina, M., Bonino, R., Castellina, A., Chiavassa, A., D'Ettorre Piazzoli, B., Di Sciascio, G., Fulgione, W., Galeotti, P., Ghia, P. L., Iacovacci, M., Mannocchi, G., Morello, C., Navarra, G., ... Vigorito, C. (2009). Evolution of the cosmic-ray anisotropy above 10¹⁴ eV. Astrophysical Journal, 692(2), L130-L133. https://doi.org/10.1088/0004-637X/692/2/L130

Aglietta, M, Alekseenko, VV, Alessandro, B, Antonioli, P, Arneodo, F, Bergamasco, L, Bertaina, M, Bonino, R, Castellina, A, Chiavassa, A, D'Ettorre Piazzoli, B, Di Sciascio, G, Fulgione, W, Galeotti, P, Ghia, PL, Iacovacci, M, Mannocchi, G, Morello, C, Navarra, G, Saavedra, O, Stamerra, A, Trinchero, GC, Valchierotti, S, Vallania, P, Vernetto, S & Vigorito, C 2009, 'Evolution of the cosmic-ray anisotropy above 10¹⁴ eV', Astrophysical Journal, vol. 692, no. 2, pp. L130-L133. https://doi.org/10.1088/0004-637X/692/2/L130

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title = "Evolution of the cosmic-ray anisotropy above 1014 eV",

abstract = "The amplitude and phase of the cosmic-ray anisotropy are well established experimentally between 1011 eV and 1014 eV. The study of their evolution in the energy region 1014-1016 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 1014 eV to higher energies by using the full data set (eight years of data taking). Results derived at about 1014 and 4 × 1014 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.",

keywords = "Cosmic rays, Diffusion",

author = "M. Aglietta and Alekseenko, {V. V.} and B. Alessandro and P. Antonioli and F. Arneodo and L. Bergamasco and M. Bertaina and R. Bonino and A. Castellina and A. Chiavassa and {D'Ettorre Piazzoli}, B. and {Di Sciascio}, G. and W. Fulgione and P. Galeotti and Ghia, {P. L.} and M. Iacovacci and G. Mannocchi and C. Morello and G. Navarra and O. Saavedra and A. Stamerra and Trinchero, {G. C.} and S. Valchierotti and P. Vallania and S. Vernetto and C. Vigorito",

year = "2009",

doi = "10.1088/0004-637X/692/2/L130",

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T1 - Evolution of the cosmic-ray anisotropy above 1014 eV

AU - Aglietta, M.

AU - Alekseenko, V. V.

AU - Alessandro, B.

AU - Antonioli, P.

AU - Arneodo, F.

AU - Bergamasco, L.

AU - Bertaina, M.

AU - Bonino, R.

AU - Castellina, A.

AU - Chiavassa, A.

AU - D'Ettorre Piazzoli, B.

AU - Di Sciascio, G.

AU - Fulgione, W.

AU - Galeotti, P.

AU - Ghia, P. L.

AU - Iacovacci, M.

AU - Mannocchi, G.

AU - Morello, C.

AU - Navarra, G.

AU - Saavedra, O.

AU - Stamerra, A.

AU - Trinchero, G. C.

AU - Valchierotti, S.

AU - Vallania, P.

AU - Vernetto, S.

AU - Vigorito, C.

PY - 2009

Y1 - 2009

N2 - The amplitude and phase of the cosmic-ray anisotropy are well established experimentally between 1011 eV and 1014 eV. The study of their evolution in the energy region 1014-1016 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 1014 eV to higher energies by using the full data set (eight years of data taking). Results derived at about 1014 and 4 × 1014 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.

AB - The amplitude and phase of the cosmic-ray anisotropy are well established experimentally between 1011 eV and 1014 eV. The study of their evolution in the energy region 1014-1016 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 1014 eV to higher energies by using the full data set (eight years of data taking). Results derived at about 1014 and 4 × 1014 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.

KW - Cosmic rays

KW - Diffusion

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