We present high-statistics, precision measurements of the detailed time and energy dependence of the primary cosmic-ray electron flux and positron flux over 79 Bartels rotations from May 2011 to May 2017 in the energy range from 1 to 50 GeV. For the first time, the charge-sign dependent modulation during solar maximum has been investigated in detail by leptons alone. Based on 23.5×106 events, we report the observation of short-term structures on the timescale of months coincident in both the electron flux and the positron flux. These structures are not visible in the e+/e- flux ratio. The precision measurements across the solar polarity reversal show that the ratio exhibits a smooth transition over 830±30 days from one value to another. The midpoint of the transition shows an energy dependent delay relative to the reversal and changes by 260±30 days from 1 to 6 GeV.

Observation of Complex Time Structures in the Cosmic-Ray Electron and Positron Fluxes with the Alpha Magnetic Spectrometer on the International Space Station

Contin, A.
Membro del Collaboration Group
;
Masi, N.
Membro del Collaboration Group
;
Palmonari, F.
Membro del Collaboration Group
;
Quadrani, L.
Membro del Collaboration Group
;
Zichichi, A.
Membro del Collaboration Group
;
2018

Abstract

We present high-statistics, precision measurements of the detailed time and energy dependence of the primary cosmic-ray electron flux and positron flux over 79 Bartels rotations from May 2011 to May 2017 in the energy range from 1 to 50 GeV. For the first time, the charge-sign dependent modulation during solar maximum has been investigated in detail by leptons alone. Based on 23.5×106 events, we report the observation of short-term structures on the timescale of months coincident in both the electron flux and the positron flux. These structures are not visible in the e+/e- flux ratio. The precision measurements across the solar polarity reversal show that the ratio exhibits a smooth transition over 830±30 days from one value to another. The midpoint of the transition shows an energy dependent delay relative to the reversal and changes by 260±30 days from 1 to 6 GeV.
Aguilar, M.; Cavasonza, L. Ali; Ambrosi, G.; Arruda, L.; Attig, N.; Aupetit, S.; Azzarello, P.; Bachlechner, A.; Barao, F.; Barrau, A.; Barrin, L.; Bartoloni, A.; Basara, L.; Başeǧmez-Du Pree, S.; Battarbee, M.; Battiston, R.; Becker, U.; Behlmann, M.; Beischer, B.; Berdugo, J.; Bertucci, B.; Bindel, K.F.; Bindi, V.; De Boer, W.; Bollweg, K.; Bonnivard, V.; Borgia, B.; Boschini, M.J.; Bourquin, M.; Bueno, E.F.; Burger, J.; Cadoux, F.; Cai, X.D.; Capell, M.; Caroff, S.; Casaus, J.; Castellini, G.; Cervelli, F.; Chae, M.J.; Chang, Y.H.; Chen, A.I.; Chen, G.M.; Chen, H.S.; Chen, Y.; Cheng, L.; Chou, H.Y.; Choumilov, E.; Choutko, V.; Chung, C.H.; Clark, C.; Clavero, R.; Coignet, G.; Consolandi, C.; Contin, A.; Corti, C.; Creus, W.; Crispoltoni, M.; Cui, Z.; Dadzie, K.; Dai, Y.M.; Datta, A.; Delgado, C.; Della Torre, S.; Demirköz, M.B.; Derome, L.; Di Falco, S.; Dimiccoli, F.; Díaz, C.; Von Doetinchem, P.; Dong, F.; Donnini, F.; Duranti, M.; D'Urso, D.; Egorov, A.; Eline, A.; Eronen, T.; Feng, J.; Fiandrini, E.; Fisher, P.; Formato, V.; Galaktionov, Y.; Gallucci, G.; García-López, R.J.; Gargiulo, C.; Gast, H.; Gebauer, I.; Gervasi, M.; Ghelfi, A.; Giovacchini, F.; Gómez-Coral, D.M.; Gong, J.; Goy, C.; Grabski, V.; Grandi, D.; Graziani, M.; Guo, K.H.; Haino, S.; Han, K.C.; He, Z.H.; Heil, M.; Hsieh, T.H.; Huang, H.; Huang, Z.C.; Huh, C.; Incagli, M.; Ionica, M.; Jang, W.Y.; Jia, Yi; Jinchi, H.; Kang, S.C.; Kanishev, K.; Khiali, B.; Kim, G.N.; Kim, K.S.; Kirn, Th.; Konak, C.; Kounina, O.; Kounine, A.; Koutsenko, V.; Kulemzin, A.; La Vacca, G.; Laudi, E.; Laurenti, G.; Lazzizzera, I.; Lebedev, A.; Lee, H.T.; Lee, S.C.; Leluc, C.; Li, H.S.; Li, J.Q.; Li, Q.; Li, T.X.; Li, Z.H.; Li, Z.Y.; Lim, S.; Lin, C.H.; Lipari, P.; Lippert, T.; Liu, D.; Liu, Hu; Lordello, V.D.; Lu, S.Q.; Lu, Y.S.; Luebelsmeyer, K.; Luo, F.; Luo, J.Z.; Lyu, S.S.; Machate, F.; Mañá, C.; Marín, J.; Martin, T.; Martínez, G.; Masi, N.; Maurin, D.; Menchaca-Rocha, A.; Meng, Q.; Mikuni, V.M.; Mo, D.C.; Mott, P.; Nelson, T.; Ni, J.Q.; Nikonov, N.; Nozzoli, F.; Oliva, A.; Orcinha, M.; Palermo, M.; Palmonari, F.; Palomares, C.; Paniccia, M.; Pauluzzi, M.; Pensotti, S.; Perrina, C.; Phan, H.D.; Picot-Clemente, N.; Pilo, F.; Pizzolotto, C.; Plyaskin, V.; Pohl, M.; Poireau, V.; Quadrani, L.; Qi, X.M.; Qin, X.; Qu, Z.Y.; Räihä, T.; Rancoita, P.G.; Rapin, D.; Ricol, J.S.; Rosier-Lees, S.; Rozhkov, A.; Rozza, D.; Sagdeev, R.; Schael, S.; Schmidt, S.M.; Von Dratzig, A. Schulz; Schwering, G.; Seo, E.S.; Shan, B.S.; Shi, J.Y.; Siedenburg, T.; Son, D.; Song, J.W.; Tacconi, M.; Tang, X.W.; Tang, Z.C.; Tescaro, D.; Ting, Samuel C. C.; Ting, S.M.; Tomassetti, N.; Torsti, J.; Türkoǧlu, C.; Urban, T.; Vagelli, V.; Valente, E.; Valtonen, E.; Vázquez Acosta, M.; Vecchi, M.; Velasco, M.; Vialle, J.P.; Wang, L.Q.; Wang, N.H.; Wang, Q.L.; Wang, X.; Wang, X.Q.; Wang, Z.X.; Wei, C.C.; Weng, Z.L.; Whitman, K.; Wu, H.; Wu, X.; Xiong, R.Q.; Xu, W.; Yan, Q.; Yang, J.; Yang, M.; Yang, Y.; Yi, H.; Yu, Y.J.; Yu, Z.Q.; Zannoni, M.; Zeissler, S.; Zhang, C.; Zhang, F.; Zhang, J.; Zhang, J.H.; Zhang, S.W.; Zhang, Z.; Zheng, Z.M.; Zhuang, H.L.; Zhukov, V.; Zichichi, A.; Zimmermann, N.; Zuccon, P.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/649139
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