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., Ambrosi, G., Arruda, L., Attig, N., Aupetit, S., et al. (2018). Observation of Complex Time Structures in the Cosmic-Ray Electron and Positron Fluxes with the Alpha Magnetic Spectrometer on the International Space Station. PHYSICAL REVIEW LETTERS, 121(5) [10.1103/PhysRevLett.121.051102].

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

Gervasi, M.;Grandi, D.;La Vacca, G.;Pensotti, S.;Rozza, D.;Tacconi, M.;Zannoni, M.;
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
Articolo in rivista - Articolo scientifico
Physics and Astronomy (all)
English
Aguilar, M., Cavasonza, L., Ambrosi, G., Arruda, L., Attig, N., Aupetit, S., et al. (2018). Observation of Complex Time Structures in the Cosmic-Ray Electron and Positron Fluxes with the Alpha Magnetic Spectrometer on the International Space Station. PHYSICAL REVIEW LETTERS, 121(5) [10.1103/PhysRevLett.121.051102].
Aguilar, M; Cavasonza, L; 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; Bindi, V; De Boer, W; Bollweg, K; Bonnivard, V; Borgia, B; Boschini, M; Bourquin, M; Bueno, E; Burger, J; Cadoux, F; Cai, X; Capell, M; Caroff, S; Casaus, J; Castellini, G; Cervelli, F; Chae, M; Chang, Y; Chen, A; Chen, G; Chen, H; Chen, Y; Cheng, L; Chou, H; Choumilov, E; Choutko, V; Chung, C; Clark, C; Clavero, R; Coignet, G; Consolandi, C; Contin, A; Corti, C; Creus, W; Crispoltoni, M; Cui, Z; Dadzie, K; Dai, Y; Datta, A; Delgado, C; Della Torre, S; Demirköz, M; 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; Gargiulo, C; Gast, H; Gebauer, I; Gervasi, M; Ghelfi, A; Giovacchini, F; Gómez-Coral, D; Gong, J; Goy, C; Grabski, V; Grandi, D; Graziani, M; Guo, K; Haino, S; Han, K; He, Z; Heil, M; Hsieh, T; Huang, H; Huang, Z; Huh, C; Incagli, M; Ionica, M; Jang, W; Jia, Y; Jinchi, H; Kang, S; Kanishev, K; Khiali, B; Kim, G; Kim, K; Kirn, T; Konak, C; Kounina, O; Kounine, A; Koutsenko, V; Kulemzin, A; La Vacca, G; Laudi, E; Laurenti, G; Lazzizzera, I; Lebedev, A; Lee, H; Lee, S; Leluc, C; Li, H; Li, J; Li, Q; Li, T; Li, Z; Li, Z; Lim, S; Lin, C; Lipari, P; Lippert, T; Liu, D; Liu, H; Lordello, V; Lu, S; Lu, Y; Luebelsmeyer, K; Luo, F; Luo, J; Lyu, S; Machate, F; Mañá, C; Marín, J; Martin, T; Martínez, G; Masi, N; Maurin, D; Menchaca-Rocha, A; Meng, Q; Mikuni, V; Mo, D; Mott, P; Nelson, T; Ni, J; Nikonov, N; Nozzoli, F; Oliva, A; Orcinha, M; Palermo, M; Palmonari, F; Palomares, C; Paniccia, M; Pauluzzi, M; Pensotti, S; Perrina, C; Phan, H; Picot-Clemente, N; Pilo, F; Pizzolotto, C; Plyaskin, V; Pohl, M; Poireau, V; Quadrani, L; Qi, X; Qin, X; Qu, Z; Räihä, T; Rancoita, P; Rapin, D; Ricol, J; Rosier-Lees, S; Rozhkov, A; Rozza, D; Sagdeev, R; Schael, S; Schmidt, S; Von Dratzig, A; Schwering, G; Seo, E; Shan, B; Shi, J; Siedenburg, T; Son, D; Song, J; Tacconi, M; Tang, X; Tang, Z; Tescaro, D; Ting, S; Ting, S; Tomassetti, N; Torsti, J; Türkoǧlu, C; Urban, T; Vagelli, V; Valente, E; Valtonen, E; Vázquez Acosta, M; Vecchi, M; Velasco, M; Vialle, J; Wang, L; Wang, N; Wang, Q; Wang, X; Wang, X; Wang, Z; Wei, C; Weng, Z; Whitman, K; Wu, H; Wu, X; Xiong, R; Xu, W; Yan, Q; Yang, J; Yang, M; Yang, Y; Yi, H; Yu, Y; Yu, Z; Zannoni, M; Zeissler, S; Zhang, C; Zhang, F; Zhang, J; Zhang, J; Zhang, S; Zhang, Z; Zheng, Z; Zhuang, H; Zhukov, V; Zichichi, A; Zimmermann, N; Zuccon, P
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