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

M Aguilar,L Ali Cavasonza,G Ambrosi,L Arruda,N Attig, S Aupetit,P Azzarello, A Bachlechner, F Barao,A Barrau, L Barrin,A Bartoloni, L Basara,S Başeğmez-du Pree,M Battarbee,R Battiston,U Becker, M Behlmann,B Beischer,J Berdugo,B Bertucci, K F Bindel,V Bindi,W de Boer, K Bollweg, V Bonnivard,B Borgia,M J Boschini, M Bourquin,E F Bueno,J Burger,F Cadoux,X D Cai,M Capell,S Caroff,J Casaus,G Castellini,F Cervelli, M J Chae,Y H Chang, A I Chen, G M Chen,H S Chen,Y Chen, L Cheng, H Y Chou, E Choumilov,V Choutko,C H Chung,C Clark, R Clavero, G Coignet,C Consolandi, A Contin,C Corti, W Creus, M Crispoltoni,Z Cui, K Dadzie, Y M Dai,A Datta,C Delgado,S Della Torre,M B Demirköz,L Derome,S Di Falco, F Dimiccoli,C Díaz,P von Doetinchem,F Dong, F Donnini,M Duranti,D D'Urso, A Egorov, A Eline,T Eronen,J Feng,E Fiandrini,P Fisher,V Formato,Y Galaktionov,G Gallucci, R J García-López,C Gargiulo,H Gast, I Gebauer,M Gervasi, A Ghelfi,F Giovacchini, D M Gómez-Coral,J Gong,C Goy,V Grabski,D Grandi,M Graziani, K H Guo,S Haino, K C Han,Z H He,M Heil, T H Hsieh,H Huang,Z C Huang,C Huh,M Incagli,M Ionica, W Y Jang,Yi Jia,H Jinchi, S C Kang, K Kanishev,B Khiali,G N Kim,K S Kim,Th Kirn,C Konak,O Kounina,A Kounine,V Koutsenko, A Kulemzin,G La Vacca, E Laudi,G Laurenti,I Lazzizzera, A Lebedev,H T Lee,S C Lee, C Leluc,H S Li,J Q Li,Q Li, T X Li,Z H Li,Z Y Li,S Lim,C H Lin,P Lipari,T Lippert,D Liu,Hu Liu, V D Lordello,S Q Lu,Y S Lu, K Luebelsmeyer,F Luo, J Z Luo, S S Lyu, F Machate,C Mañá,J Marín,T Martin,G Martínez,N Masi,D Maurin,A Menchaca-Rocha,Q Meng,V M Mikuni, D C Mo, P Mott,T Nelson, J Q Ni,N Nikonov,F Nozzoli,A Oliva,M Orcinha,M Palermo, F Palmonari,C Palomares,M Paniccia,M Pauluzzi, S Pensotti,C Perrina,H D Phan,N Picot-Clemente,F Pilo,C Pizzolotto,V Plyaskin, M Pohl,V Poireau,L Quadrani,X M Qi,X Qin, Z Y Qu, T Räihä,P G Rancoita, D Rapin,J S Ricol,S Rosier-Lees,A Rozhkov,D Rozza,R Sagdeev,S Schael,S M Schmidt,A Schulz von Dratzig, G Schwering,E S Seo, B S Shan,J Y Shi, T Siedenburg,D Son, J W Song,M Tacconi, X W Tang,Z C Tang, D Tescaro,Samuel C C Ting, S M Ting,N Tomassetti,J Torsti,C Türkoğlu,T Urban,V Vagelli, E Valente,E Valtonen,M Vázquez Acosta,M Vecchi,M Velasco, J P Vialle,L Q Wang,N H Wang,Q L Wang,X Wang, X Q Wang,Z X Wang, C C Wei, Z L Weng,K Whitman,H Wu,X Wu,R Q Xiong,W Xu,Q Yan,J Yang,M Yang,Y Yang,H Yi,Y J Yu, Z Q Yu,M Zannoni, S Zeissler,C Zhang,F Zhang,J Zhang, J H Zhang,S W Zhang,Z Zhang,Z M Zheng,H L Zhuang,V Zhukov, A Zichichi,N Zimmermann,P Zuccon

PHYSICAL REVIEW LETTERS（2018）

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摘要

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 x 10(6) 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.

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关键词

positron fluxes,alpha magnetic spectrometer,complex time structures,cosmic-ray

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