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Temporal Structures in Positron Spectra and Charge-Sign Effects in Galactic Cosmic Rays

  • M. Aguilar
  • , G. Ambrosi
  • , H. Anderson
  • , L. Arruda
  • , N. Attig
  • , C. Bagwell
  • , F. Barao
  • , M. Barbanera
  • , L. Barrin
  • , A. Bartoloni
  • , R. Battiston
  • , N. Belyaev
  • , J. Berdugo
  • , B. Bertucci
  • , V. Bindi
  • , K. Bollweg
  • , J. Bolster
  • , M. Borchiellini
  • , B. Borgia
  • , M. J. Boschini
  • M. Bourquin, J. Burger, W. J. Burger, X. D. Cai, M. Capell, J. Casaus, G. Castellini, F. Cervelli, Y. H. Chang, G. M. Chen, G. R. Chen, H. Chen, H. S. Chen, Y. Chen, L. Cheng, H. Y. Chou, S. Chouridou, V. Choutko, C. H. Chung, C. Clark, G. Coignet, C. Consolandi, A. Contin, C. Corti, Z. Cui, K. Dadzie, F. D'angelo, A. Dass, C. Delgado, S. Della Torre, M. B. Demirköz, L. Derome, S. Di Falco, V. Di Felice, C. Díaz, F. Dimiccoli, P. Von Doetinchem, F. Dong, F. Donnini, M. Duranti, A. Egorov, A. Eline, F. Faldi, J. Feng, E. Fiandrini, P. Fisher, V. Formato, C. Gámez, R. J. García-López, C. Gargiulo, H. Gast, M. Gervasi, F. Giovacchini, D. M. Gómez-Coral, J. Gong, C. Goy, D. Grandi, M. Graziani, A. N. Guracho, S. Haino, K. C. Han, R. K. Hashmani, Z. H. He, B. Heber, T. H. Hsieh, J. Y. Hu, B. W. Huang, M. Ionica, M. Incagli, Yi Jia, H. Jinchi, G. Karagöz, S. Khan, B. Khiali, Th Kirn, A. P. Klipfel, O. Kounina, A. Kounine, V. Koutsenko, D. Krasnopevtsev, A. Kuhlman, A. Kulemzin, G. La Vacca, E. Laudi, G. Laurenti, G. Lavecchia, I. Lazzizzera, H. T. Lee, S. C. Lee, H. L. Li, J. Q. Li, M. Li, M. Li, Q. Li, Q. Li, Q. Y. Li, S. Li, S. L. Li, J. H. Li, Z. H. Li, J. Liang, M. J. Liang, C. H. Lin, T. Lippert, J. H. Liu, S. Q. Lu, Y. S. Lu, K. Luebelsmeyer, J. Z. Luo, S. D. Luo, Xi Luo, C. Mañá, J. Marín, J. Marquardt, T. Martin, G. Martínez, N. Masi, D. Maurin, T. Medvedeva, A. Menchaca-Rocha, Q. Meng, M. Molero, P. Mott, L. Mussolin, Y. Najafi Jozani, J. Negrete, R. Nicolaidis, N. Nikonov, F. Nozzoli, J. Ocampo-Peleteiro, A. Oliva, M. Orcinha, M. A. Ottupara, M. Palermo, F. Palmonari, M. Paniccia, A. Pashnin, M. Pauluzzi, S. Pensotti, V. Plyaskin, S. Poluianov, X. Qin, Z. Y. Qu, L. Quadrani, P. G. Rancoita, D. Rapin, A. Reina Conde, E. Robyn, I. Rodríguez-García, L. Romaneehsen, F. Rossi, A. Rozhkov, D. Rozza, R. Sagdeev, E. Savin, S. Schael, A. Schultz Von Dratzig, G. Schwering, E. S. Seo, B. S. Shan, T. Siedenburg, G. Silvestre, J. W. Song, X. J. Song, R. Sonnabend, L. Strigari, T. Su, Q. Sun, Z. T. Sun, M. Tacconi, X. W. Tang, Z. C. Tang, J. Tian, Y. Tian, Samuel C.C. Ting, S. M. Ting, N. Tomassetti, J. Torsti, T. Urban, I. Usoskin, V. Vagelli, R. Vainio, M. Valencia-Otero, E. Valente, E. Valtonen, M. Vázquez Acosta, M. Vecchi, M. Velasco, J. P. Vialle, C. X. Wang, L. Wang, L. Q. Wang, N. H. Wang, Q. L. Wang, S. Wang, X. Wang, Yu Wang, Z. M. Wang, J. Wei, Z. L. Weng, H. Wu, Y. Wu, J. N. Xiao, R. Q. Xiong, X. Z. Xiong, W. Xu, Q. Yan, H. T. Yang, Y. Yang, A. Yelland, H. Yi, Y. H. You, Y. M. Yu, Z. Q. Yu, C. Zhang, F. Zhang, F. Z. Zhang, J. Zhang, J. H. Zhang, Z. Zhang, F. Zhao, C. Zheng, Z. M. Zheng, H. L. Zhuang, V. Zhukov, A. Zichichi, P. Zuccon
  • CIEMAT
  • National Institute for Nuclear Physics
  • Massachusetts Institute of Technology
  • Laboratório de Instrumentação e Física Experimental de Partículas
  • Jülich Research Centre
  • CERN
  • University of Trento
  • University of Perugia
  • University of Hawai'i at Mānoa
  • NASA Johnson Space Center
  • University of Groningen
  • University of Rome La Sapienza
  • University of Geneva
  • National Research Council of Italy
  • Academia Sinica - Institute of Physics
  • CAS - Institute of High Energy Physics
  • University of Chinese Academy of Sciences
  • Shandong Institute of Advanced Technology
  • Zhejiang University
  • RWTH Aachen University
  • Université Grenoble Alpes
  • University of Bologna
  • Shandong University
  • Middle East Technical University
  • Southeast University, Nanjing
  • Sun Yat-Sen University
  • Instituto de Astrofísica de Canarias
  • University of Milan - Bicocca
  • Universidad Nacional Autónoma de México
  • Chung-shan Institute of Science and Technology Taiwan
  • Kiel University
  • Academia Sinica Taiwan HQ
  • CAS - Institute of Electrical Engineering
  • University of Oulu
  • University of Maryland, College Park
  • Also at IRCCS Azienda Ospedaliero-Universitaria di Bologna
  • University of Turku
  • Italian Space Agency
  • National Central University
  • National Cheng Kung University
  • Beihang University

Research output: Contribution to journalArticlepeer-review

Abstract

We present the precision measurements of 11 years of daily cosmic positron fluxes in the rigidity range from 1.00 to 41.9 GV based on 3.4×106 positrons collected with the Alpha Magnetic Spectrometer (AMS) aboard the International Space Station. The positron fluxes show distinctly different time variations from the electron fluxes at short and long timescales. A hysteresis between the electron fluxes and the positron fluxes is observed with a significance greater than 5σ at rigidities below 8.5 GV. On the contrary, the positron fluxes and the proton fluxes show similar time variation. Remarkably, we found that positron fluxes are modulated more than proton fluxes with a significance greater than 5σ for rigidities below 7 GV. These continuous daily positron fluxes, together with AMS daily electron, proton, and helium fluxes over an 11-year solar cycle, provide unique input to the understanding of both the charge-sign and mass dependencies of cosmic rays in the heliosphere.

Original languageEnglish
Article number151002
JournalPhysical Review Letters
Volume131
Issue number15
DOIs
StatePublished - 13 Oct 2023

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