A measurement of the solar and sidereal cosmic-ray anisotropy at e0 ∼ 1014 eV

M. Aglietta; B. Alessandro; P. Antonioli; F. Arneodo; L. Bergamasco; M. Bertaina; A. Bosio; A. Castellina; C. Castagnoli; A. Chtavassa; G. Clni Castagnoli; B. D'Ettorre Plazzoli; G. Dl Sciascio; W. Fulgione; P. Galeotti; P. L. Ghia; M. Iacovacci; G. Mannocchi; C. Melagrana; N. Mengotti Sllva; C. Morello; G. Navarra; L. Rlccati; O. Saavedra; G. C. Trinchero; P. Vallania; S. Vernetto

doi:10.1086/177881

A measurement of the solar and sidereal cosmic-ray anisotropy at e₀ ∼ 10¹⁴ eV

M. Aglietta, B. Alessandro, P. Antonioli, F. Arneodo, L. Bergamasco, M. Bertaina, A. Bosio, A. Castellina, C. Castagnoli, A. Chtavassa, G. Clni Castagnoli, B. D'Ettorre Plazzoli, G. Dl Sciascio, W. Fulgione, P. Galeotti, P. L. Ghia, M. Iacovacci, G. Mannocchi, C. Melagrana, N. Mengotti SllvaC. Morello, G. Navarra, L. Rlccati, O. Saavedra, G. C. Trinchero, P. Vallania, S. Vernetto

Physics

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

Abstract

The results of the measurement of the cosmic-ray solar and sidereal anisotropies at primary energy E₀ ≈ 10¹⁴ eV performed by the EAS-TOP Extensive Air Shower array (Campo Imperatore, National Gran Sasso Laboratories, 2005 m above sea level, latitude 42°.5 N are presented. The measurement includes 4 years of data taking (1990, 1992, 1993, 1994) for a total of 1.3 × 10⁹ events and is performed at two different mean primary energies: E₀^v ≈ 1.5 × 10¹⁴ eV and E₀ⁱ ≈ 2.5 × 10¹⁴ eV. The two results are compatible (within 2 σ) and can therefore be combined. The obtained amplitude and phase of the first harmonic in sidereal time are (in the equatorial plane) A_{sid, δ=0}, (E₀ ≈ 2 × 10¹⁴ eV) = (3.73 ± 0.57) × 10^-4 and _sid = 1.82 ± 0.49 hr local sidereal time, with significance 6.5 a. The amplitude of the anisotropy exhibits the expected cos δ dependence. A first harmonic in solar time compatible with the expected Compton-Getting effect due to the motion of revolution of the Earth around the Sun is observed with significance 7.3 σ. The corresponding measured amplitude and phase (also in the equatorial plane) are A_{sol, δ=0°} = (4.06 ± 0.55) × 10^-4 and _sol = 4.92 ± 0.53 hr, the expected values being 4.7 × 10^-4 and 6.0 hr. Different checks of stability of the detectors and consistency of the data are presented.

Original language	English (US)
Pages (from-to)	501-505
Number of pages	5
Journal	Astrophysical Journal
Volume	470
Issue number	1 PART I
DOIs	https://doi.org/10.1086/177881
State	Published - 1996

Keywords

Cosmic rays
Galaxy: General
Solar system: General

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/177881

Cite this

Aglietta, M., Alessandro, B., Antonioli, P., Arneodo, F., Bergamasco, L., Bertaina, M., Bosio, A., Castellina, A., Castagnoli, C., Chtavassa, A., Castagnoli, G. C., D'Ettorre Plazzoli, B., Dl Sciascio, G., Fulgione, W., Galeotti, P., Ghia, P. L., Iacovacci, M., Mannocchi, G., Melagrana, C., ... Vernetto, S. (1996). A measurement of the solar and sidereal cosmic-ray anisotropy at e₀ ∼ 10¹⁴ eV. Astrophysical Journal, 470(1 PART I), 501-505. https://doi.org/10.1086/177881

A measurement of the solar and sidereal cosmic-ray anisotropy at e₀ ∼ 10¹⁴ eV. / Aglietta, M.; Alessandro, B.; Antonioli, P.; Arneodo, F.; Bergamasco, L.; Bertaina, M.; Bosio, A.; Castellina, A.; Castagnoli, C.; Chtavassa, A.; Castagnoli, G. Clni; D'Ettorre Plazzoli, B.; Dl Sciascio, G.; Fulgione, W.; Galeotti, P.; Ghia, P. L.; Iacovacci, M.; Mannocchi, G.; Melagrana, C.; Sllva, N. Mengotti; Morello, C.; Navarra, G.; Rlccati, L.; Saavedra, O.; Trinchero, G. C.; Vallania, P.; Vernetto, S.

In: Astrophysical Journal, Vol. 470, No. 1 PART I, 1996, p. 501-505.

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

Aglietta, M, Alessandro, B, Antonioli, P, Arneodo, F, Bergamasco, L, Bertaina, M, Bosio, A, Castellina, A, Castagnoli, C, Chtavassa, A, Castagnoli, GC, D'Ettorre Plazzoli, B, Dl Sciascio, G, Fulgione, W, Galeotti, P, Ghia, PL, Iacovacci, M, Mannocchi, G, Melagrana, C, Sllva, NM, Morello, C, Navarra, G, Rlccati, L, Saavedra, O, Trinchero, GC, Vallania, P & Vernetto, S 1996, 'A measurement of the solar and sidereal cosmic-ray anisotropy at e₀ ∼ 10¹⁴ eV', Astrophysical Journal, vol. 470, no. 1 PART I, pp. 501-505. https://doi.org/10.1086/177881

Aglietta, M. ; Alessandro, B. ; Antonioli, P. ; Arneodo, F. ; Bergamasco, L. ; Bertaina, M. ; Bosio, A. ; Castellina, A. ; Castagnoli, C. ; Chtavassa, A. ; Castagnoli, G. Clni ; D'Ettorre Plazzoli, B. ; Dl Sciascio, G. ; Fulgione, W. ; Galeotti, P. ; Ghia, P. L. ; Iacovacci, M. ; Mannocchi, G. ; Melagrana, C. ; Sllva, N. Mengotti ; Morello, C. ; Navarra, G. ; Rlccati, L. ; Saavedra, O. ; Trinchero, G. C. ; Vallania, P. ; Vernetto, S. / A measurement of the solar and sidereal cosmic-ray anisotropy at e₀ ∼ 10¹⁴ eV. In: Astrophysical Journal. 1996 ; Vol. 470, No. 1 PART I. pp. 501-505.

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abstract = "The results of the measurement of the cosmic-ray solar and sidereal anisotropies at primary energy E0 ≈ 1014 eV performed by the EAS-TOP Extensive Air Shower array (Campo Imperatore, National Gran Sasso Laboratories, 2005 m above sea level, latitude 42°.5 N are presented. The measurement includes 4 years of data taking (1990, 1992, 1993, 1994) for a total of 1.3 × 109 events and is performed at two different mean primary energies: E0v ≈ 1.5 × 1014 eV and E0i ≈ 2.5 × 1014 eV. The two results are compatible (within 2 σ) and can therefore be combined. The obtained amplitude and phase of the first harmonic in sidereal time are (in the equatorial plane) Asid, δ=0, (E0 ≈ 2 × 1014 eV) = (3.73 ± 0.57) × 10-4 and sid = 1.82 ± 0.49 hr local sidereal time, with significance 6.5 a. The amplitude of the anisotropy exhibits the expected cos δ dependence. A first harmonic in solar time compatible with the expected Compton-Getting effect due to the motion of revolution of the Earth around the Sun is observed with significance 7.3 σ. The corresponding measured amplitude and phase (also in the equatorial plane) are Asol, δ=0° = (4.06 ± 0.55) × 10-4 and sol = 4.92 ± 0.53 hr, the expected values being 4.7 × 10-4 and 6.0 hr. Different checks of stability of the detectors and consistency of the data are presented.",

keywords = "Cosmic rays, Galaxy: General, Solar system: General",

author = "M. Aglietta and B. Alessandro and P. Antonioli and F. Arneodo and L. Bergamasco and M. Bertaina and A. Bosio and A. Castellina and C. Castagnoli and A. Chtavassa and Castagnoli, {G. Clni} and {D'Ettorre Plazzoli}, B. and {Dl Sciascio}, G. and W. Fulgione and P. Galeotti and Ghia, {P. L.} and M. Iacovacci and G. Mannocchi and C. Melagrana and Sllva, {N. Mengotti} and C. Morello and G. Navarra and L. Rlccati and O. Saavedra and Trinchero, {G. C.} and P. Vallania and S. Vernetto",

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T1 - A measurement of the solar and sidereal cosmic-ray anisotropy at e0 ∼ 1014 eV

AU - Aglietta, M.

AU - Alessandro, B.

AU - Antonioli, P.

AU - Arneodo, F.

AU - Bergamasco, L.

AU - Bertaina, M.

AU - Bosio, A.

AU - Castellina, A.

AU - Castagnoli, C.

AU - Chtavassa, A.

AU - Castagnoli, G. Clni

AU - D'Ettorre Plazzoli, B.

AU - Dl Sciascio, G.

AU - Fulgione, W.

AU - Galeotti, P.

AU - Ghia, P. L.

AU - Iacovacci, M.

AU - Mannocchi, G.

AU - Melagrana, C.

AU - Sllva, N. Mengotti

AU - Morello, C.

AU - Navarra, G.

AU - Rlccati, L.

AU - Saavedra, O.

AU - Trinchero, G. C.

AU - Vallania, P.

AU - Vernetto, S.

PY - 1996

Y1 - 1996

N2 - The results of the measurement of the cosmic-ray solar and sidereal anisotropies at primary energy E0 ≈ 1014 eV performed by the EAS-TOP Extensive Air Shower array (Campo Imperatore, National Gran Sasso Laboratories, 2005 m above sea level, latitude 42°.5 N are presented. The measurement includes 4 years of data taking (1990, 1992, 1993, 1994) for a total of 1.3 × 109 events and is performed at two different mean primary energies: E0v ≈ 1.5 × 1014 eV and E0i ≈ 2.5 × 1014 eV. The two results are compatible (within 2 σ) and can therefore be combined. The obtained amplitude and phase of the first harmonic in sidereal time are (in the equatorial plane) Asid, δ=0, (E0 ≈ 2 × 1014 eV) = (3.73 ± 0.57) × 10-4 and sid = 1.82 ± 0.49 hr local sidereal time, with significance 6.5 a. The amplitude of the anisotropy exhibits the expected cos δ dependence. A first harmonic in solar time compatible with the expected Compton-Getting effect due to the motion of revolution of the Earth around the Sun is observed with significance 7.3 σ. The corresponding measured amplitude and phase (also in the equatorial plane) are Asol, δ=0° = (4.06 ± 0.55) × 10-4 and sol = 4.92 ± 0.53 hr, the expected values being 4.7 × 10-4 and 6.0 hr. Different checks of stability of the detectors and consistency of the data are presented.

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