Format

Send to

Choose Destination
Phys Rev Lett. 2018 Aug 3;121(5):051101. doi: 10.1103/PhysRevLett.121.051101.

Observation of Fine Time Structures in the Cosmic Proton and Helium Fluxes with the Alpha Magnetic Spectrometer on the International Space Station.

Aguilar M1, Ali Cavasonza L2, Alpat B3, Ambrosi G3, Arruda L4, Attig N5, Aupetit S6, Azzarello P7, Bachlechner A2, Barao F4, Barrau A6, Barrin L8, Bartoloni A9, Basara L10, Başeğmez-du Pree S11, Battarbee M12, Battiston R10,13, Becker U14, Behlmann M14, Beischer B2, Berdugo J1, Bertucci B3,15, Bindel KF16, Bindi V17, de Boer W16, Bollweg K18, Bonnivard V6, Borgia B9,19, Boschini MJ20, Bourquin M7, Bueno EF21, Burger J14, Cadoux F7, Cai XD14, Capell M14, Caroff S22, Casaus J1, Castellini G23, Cervelli F24, Chae MJ25, Chang YH26, Chen AI14, Chen GM11, Chen HS11,27, Chen Y7, Cheng L28, Chou HY26, Choumilov E14, Choutko V14, Chung CH2, Clark C18, Clavero R29, Coignet G22, Consolandi C17, Contin A30,31, Corti C17, Creus W32, Crispoltoni M3,15, Cui Z28, Dadzie K14, Dai YM33, Datta A17, Delgado C1, Della Torre S20, Demirköz MB34, Derome L6, Di Falco S24, Dimiccoli F10,13, Díaz C1, von Doetinchem P17, Dong F35, Donnini F3,15, Duranti M3, D'Urso D3, Egorov A14, Eline A14, Eronen T12, Feng J14, Fiandrini E3,15, Fisher P14, Formato V3, Galaktionov Y14, Gallucci G24, García-López RJ29, Gargiulo C8, Gast H2, Gebauer I16, Gervasi M20,36, Ghelfi A6, Giovacchini F1, Gómez-Coral DM37, Gong J35, Goy C22, Grabski V37, Grandi D20, Graziani M16, Guo KH38, Haino S32, Han KC39, He ZH38, Heil M14, Hoffman J17, Hsieh TH14, Huang H32, Huang ZC38, Huh C40, Incagli M24, Ionica M3, Jang WY40, Jia Y14, Jinchi H39, Kang SC40, Kanishev K8,10, Khiali B26, Kim GN40, Kim KS40, Kirn T2, Konak C34, Kounina O14, Kounine A14, Koutsenko V14, Kulemzin A14, La Vacca G20,36, Laudi E8, Laurenti G30, Lazzizzera I10,13, Lebedev A14, Lee HT41, Lee SC32, Leluc C7, Li HS42, Li JQ35, Li Q35, Li TX38, Li ZH11, Li ZY32, Light C17, Lim S40, Lin CH32, Lipari P9, Lippert T5, Liu D26, Liu H14, Lordello VD21, Lu SQ32, Lu YS11, Luebelsmeyer K2, Luo F28, Luo JZ35, Luo X17, Lyu SS38, Machate F2, Mañá C1, Marín J1, Martin T18, Martínez G1, Masi N30, Maurin D6, Menchaca-Rocha A37, Meng Q35, Mikuni VM21, Mo DC38, Mott P18, Nelson T17, Ni JQ38, Nikonov N2, Nozzoli F3, Oliva A1, Orcinha M4, Palermo M17, Palmonari F30,31, Palomares C1, Paniccia M7, Pauluzzi M3,15, Pensotti S20,36, Perrina C7, Phan HD14, Picot-Clemente N43, Pilo F24, Pizzolotto C3, Plyaskin V14, Pohl M7, Poireau V22, Popkow A17, Quadrani L30,31, Qi XM38, Qin X14, Qu ZY32, Räihä T2, Rancoita PG20, Rapin D7, Ricol JS6, Rosier-Lees S22, Rozhkov A14, Rozza D20,36, Sagdeev R44, Schael S2, Schmidt SM5, Schulz von Dratzig A2, Schwering G2, Seo ES43, Shan BS45, Shi JY35, Siedenburg T2, Son D40, Song JW28, Tacconi M20,36, Tang XW11, Tang ZC11, Tescaro D29, Ting SCC14,8, Ting SM14, Tomassetti N3,15, Torsti J12, Türkoğlu C34, Urban T18, Vagelli V3,15, Valente E9,19, Valtonen E12, Vázquez Acosta M29, Vecchi M21, Velasco M1, Vialle JP22, Wang LQ28, Wang NH28, Wang QL33, Wang X14, Wang XQ11,27, Wang ZX38, Wei CC32, Weng ZL14, Whitman K17, Wu H35, Wu X7, Xiong RQ35, Xu W14, Yan Q14, Yang J25, Yang M11, Yang Y42, Yi H35, Yu YJ33, Yu ZQ11, Zannoni M20,36, Zeissler S16, Zhang C11, Zhang F11, Zhang J14, Zhang JH35, Zhang SW11,27, Zhang Z14, Zheng ZM45, Zhuang HL11, Zhukov V2, Zichichi A30,31, Zimmermann N2, Zuccon P14; AMS Collaboration.

Author information

1
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), E-28040 Madrid, Spain.
2
I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germany.
3
INFN Sezione di Perugia, I-06100 Perugia, Italy.
4
Laboratório de Instrumentação e Física Experimental de Partículas (LIP), P-1000 Lisboa, Portugal.
5
Jülich Supercomputing Centre and JARA-FAME, Research Centre Jülich, D-52425 Jülich, Germany.
6
Laboratoire de Physique Subatomique et de Cosmologie (LPSC), CNRS/IN2P3 and Université Grenoble-Alpes, F-38026 Grenoble, France.
7
DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
8
European Organization for Nuclear Research (CERN), CH-1211 Geneva 23, Switzerland.
9
INFN Sezione di Roma 1, I-00185 Roma, Italy.
10
INFN TIFPA, I-38123 Povo, Trento, Italy.
11
Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, 100049, China.
12
Space Research Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland.
13
Università di Trento, I-38123 Povo, Trento, Italy.
14
Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA.
15
Università di Perugia, I-06100 Perugia, Italy.
16
Institut für Experimentelle Teilchenphysik, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany.
17
Physics and Astronomy Department, University of Hawaii, Honolulu, Hawaii 96822, USA.
18
National Aeronautics and Space Administration Johnson Space Center (JSC), Jacobs Engineering, and Business Integra, Houston, Texas 77058, USA.
19
Università di Roma La Sapienza, I-00185 Roma, Italy.
20
INFN Sezione di Milano-Bicocca, I-20126 Milano, Italy.
21
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970, São Carlos, São Paulo, SP, Brazil.
22
Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), CNRS/IN2P3 and Université Savoie Mont Blanc, F-74941 Annecy-le-Vieux, France.
23
CNR-IROE, I-50125 Firenze, Italy.
24
INFN Sezione di Pisa, I-56100 Pisa, Italy.
25
Department of Physics, Ewha Womans University, Seoul, 120-750, Korea.
26
National Central University (NCU), Chung-Li, Tao Yuan, 32054, Taiwan.
27
University of Chinese Academy of Sciences (UCAS), Beijing, 100049, China.
28
Shandong University (SDU), Jinan, Shandong, 250100, China.
29
Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, and Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain.
30
INFN Sezione di Bologna, I-40126 Bologna, Italy.
31
Università di Bologna, I-40126 Bologna, Italy.
32
Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan.
33
Institute of Electrical Engineering (IEE), Chinese Academy of Sciences, Beijing, 100190, China.
34
Department of Physics, Middle East Technical University (METU), 06800 Ankara, Turkey.
35
Southeast University (SEU), Nanjing, 210096, China.
36
Università di Milano-Bicocca, I-20126 Milano, Italy.
37
Instituto de Física, Universidad Nacional Autónoma de México (UNAM), México, D. F., 01000 Mexico.
38
Sun Yat-Sen University (SYSU), Guangzhou, 510275, China.
39
National Chung-Shan Institute of Science and Technology (NCSIST), Longtan, Tao Yuan, 32546, Taiwan.
40
CHEP, Kyungpook National University, 41566 Daegu, Korea.
41
Academia Sinica Grid Center (ASGC), Nankang, Taipei, 11529, Taiwan.
42
National Cheng Kung University, Tainan, 70101, Taiwan.
43
IPST, University of Maryland, College Park, Maryland 20742, USA.
44
East-West Center for Space Science, University of Maryland, College Park, Maryland 20742, USA.
45
Beihang University (BUAA), Beijing, 100191, China.

Abstract

We present the precision measurement from May 2011 to May 2017 (79 Bartels rotations) of the proton fluxes at rigidities from 1 to 60 GV and the helium fluxes from 1.9 to 60 GV based on a total of 1×10^{9} events collected with the Alpha Magnetic Spectrometer aboard the International Space Station. This measurement is in solar cycle 24, which has the solar maximum in April 2014. We observed that, below 40 GV, the proton flux and the helium flux show nearly identical fine structures in both time and relative amplitude. The amplitudes of the flux structures decrease with increasing rigidity and vanish above 40 GV. The amplitudes of the structures are reduced during the time period, which started one year after solar maximum, when the proton and helium fluxes steadily increase. Above ∼3  GV the p/He flux ratio is time independent. We observed that below ∼3  GV the ratio has a long-term decrease coinciding with the period during which the fluxes start to rise.

Supplemental Content

Full text links

Icon for American Physical Society
Loading ...
Support Center