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Adriani O, Barbarino GC, Bazilevskaya GA, Bellotti R, Boezio M, Bogomolov EA, Bongi M, Bonvicini V, Bottai S, Bruno A, Cafagna F, Campana D, Carlson P, Casolino M, Castellini G, De Santis C, Di Felice V, Galper AM, Karelin AV, Koldashov SV, Koldobskiy SA, Krutkov SY, Kvashnin AN, Leonov A, Malakhov V, Marcelli L, Martucci M, Mayorov AG, Menn W, Mergé M, Mikhailov VV, Mocchiutti E, Monaco A, Mori N, Munini R, Osteria G, Panico B, Papini P, Pearce M, Picozza P, Ricci M, Ricciarini SB, Simon M, Sparvoli R, Spillantini P, Stozhkov YI, Vacchi A, Vannuccini E, Vasilyev GI, Voronov SA, Yurkin YT, Zampa G, Zampa N, Potgieter MS, Vos EE. Time Dependence of the Electron and Positron Components of the Cosmic Radiation Measured by the PAMELA Experiment between July 2006 and December 2015. Phys Rev Lett 2016; 116:241105. [PMID: 27367381 DOI: 10.1103/physrevlett.116.241105] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Indexed: 06/06/2023]
Abstract
Cosmic-ray electrons and positrons are a unique probe of the propagation of cosmic rays as well as of the nature and distribution of particle sources in our Galaxy. Recent measurements of these particles are challenging our basic understanding of the mechanisms of production, acceleration, and propagation of cosmic rays. Particularly striking are the differences between the low energy results collected by the space-borne PAMELA and AMS-02 experiments and older measurements pointing to sign-charge dependence of the solar modulation of cosmic-ray spectra. The PAMELA experiment has been measuring the time variation of the positron and electron intensity at Earth from July 2006 to December 2015 covering the period for the minimum of solar cycle 23 (2006-2009) until the middle of the maximum of solar cycle 24, through the polarity reversal of the heliospheric magnetic field which took place between 2013 and 2014. The positron to electron ratio measured in this time period clearly shows a sign-charge dependence of the solar modulation introduced by particle drifts. These results provide the first clear and continuous observation of how drift effects on solar modulation have unfolded with time from solar minimum to solar maximum and their dependence on the particle rigidity and the cyclic polarity of the solar magnetic field.
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Affiliation(s)
- O Adriani
- University of Florence, Department of Physics, I-50019 Sesto Fiorentino, Florence, Italy
- INFN, Sezione di Florence, I-50019 Sesto Fiorentino, Florence, Italy
| | - G C Barbarino
- University of Naples "Federico II", Department of Physics, I-80126 Naples, Italy
- INFN, Sezione di Naples, I-80126 Naples, Italy
| | | | - R Bellotti
- University of Bari, Department of Physics, I-70126 Bari, Italy
- INFN, Sezione di Bari, I-70126 Bari, Italy
| | - M Boezio
- INFN, Sezione di Trieste, I-34149 Trieste, Italy
| | - E A Bogomolov
- Ioffe Physical Technical Institute, RU-194021 St. Petersburg, Russia
| | - M Bongi
- University of Florence, Department of Physics, I-50019 Sesto Fiorentino, Florence, Italy
- INFN, Sezione di Florence, I-50019 Sesto Fiorentino, Florence, Italy
| | - V Bonvicini
- INFN, Sezione di Trieste, I-34149 Trieste, Italy
| | - S Bottai
- INFN, Sezione di Florence, I-50019 Sesto Fiorentino, Florence, Italy
| | - A Bruno
- University of Bari, Department of Physics, I-70126 Bari, Italy
- INFN, Sezione di Bari, I-70126 Bari, Italy
| | - F Cafagna
- INFN, Sezione di Bari, I-70126 Bari, Italy
| | - D Campana
- INFN, Sezione di Naples, I-80126 Naples, Italy
| | - P Carlson
- KTH Royal Institute of Technology, Department of Physics, and the Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, SE-10691 Stockholm, Sweden
| | - M Casolino
- INFN, Sezione di Rome "Tor Vergata", I-00133 Rome, Italy
| | | | - C De Santis
- INFN, Sezione di Rome "Tor Vergata", I-00133 Rome, Italy
- University of Rome "Tor Vergata", Department of Physics, I-00133 Rome, Italy
| | - V Di Felice
- INFN, Sezione di Rome "Tor Vergata", I-00133 Rome, Italy
- Agenzia Spaziale Italiana (ASI) Science Data Center, Via del Politecnico snc, I-00133 Rome, Italy
| | - A M Galper
- National Research Nuclear University MEPhI, RU-115409 Moscow, Russia
| | - A V Karelin
- National Research Nuclear University MEPhI, RU-115409 Moscow, Russia
| | - S V Koldashov
- National Research Nuclear University MEPhI, RU-115409 Moscow, Russia
| | - S A Koldobskiy
- National Research Nuclear University MEPhI, RU-115409 Moscow, Russia
| | - S Y Krutkov
- Ioffe Physical Technical Institute, RU-194021 St. Petersburg, Russia
| | - A N Kvashnin
- Lebedev Physical Institute, RU-119991 Moscow, Russia
| | - A Leonov
- National Research Nuclear University MEPhI, RU-115409 Moscow, Russia
| | - V Malakhov
- National Research Nuclear University MEPhI, RU-115409 Moscow, Russia
| | - L Marcelli
- University of Rome "Tor Vergata", Department of Physics, I-00133 Rome, Italy
| | - M Martucci
- University of Rome "Tor Vergata", Department of Physics, I-00133 Rome, Italy
- INFN, Laboratori Nazionali di Frascati, Via Enrico Fermi 40, I-00044 Frascati, Italy
| | - A G Mayorov
- National Research Nuclear University MEPhI, RU-115409 Moscow, Russia
| | - W Menn
- Universität Siegen, Department of Physics, D-57068 Siegen, Germany
| | - M Mergé
- INFN, Sezione di Rome "Tor Vergata", I-00133 Rome, Italy
- University of Rome "Tor Vergata", Department of Physics, I-00133 Rome, Italy
| | - V V Mikhailov
- National Research Nuclear University MEPhI, RU-115409 Moscow, Russia
| | - E Mocchiutti
- INFN, Sezione di Trieste, I-34149 Trieste, Italy
| | - A Monaco
- University of Bari, Department of Physics, I-70126 Bari, Italy
- INFN, Sezione di Bari, I-70126 Bari, Italy
| | - N Mori
- INFN, Sezione di Florence, I-50019 Sesto Fiorentino, Florence, Italy
| | - R Munini
- INFN, Sezione di Trieste, I-34149 Trieste, Italy
- University of Trieste, Department of Physics, I-34147 Trieste, Italy
| | - G Osteria
- INFN, Sezione di Naples, I-80126 Naples, Italy
| | - B Panico
- INFN, Sezione di Naples, I-80126 Naples, Italy
| | - P Papini
- INFN, Sezione di Florence, I-50019 Sesto Fiorentino, Florence, Italy
| | - M Pearce
- KTH Royal Institute of Technology, Department of Physics, and the Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, SE-10691 Stockholm, Sweden
| | - P Picozza
- INFN, Sezione di Rome "Tor Vergata", I-00133 Rome, Italy
- University of Rome "Tor Vergata", Department of Physics, I-00133 Rome, Italy
| | - M Ricci
- INFN, Laboratori Nazionali di Frascati, Via Enrico Fermi 40, I-00044 Frascati, Italy
| | - S B Ricciarini
- INFN, Sezione di Florence, I-50019 Sesto Fiorentino, Florence, Italy
| | - M Simon
- Universität Siegen, Department of Physics, D-57068 Siegen, Germany
| | - R Sparvoli
- INFN, Sezione di Rome "Tor Vergata", I-00133 Rome, Italy
- University of Rome "Tor Vergata", Department of Physics, I-00133 Rome, Italy
| | - P Spillantini
- National Research Nuclear University MEPhI, RU-115409 Moscow, Russia
| | - Y I Stozhkov
- Lebedev Physical Institute, RU-119991 Moscow, Russia
| | - A Vacchi
- INFN, Sezione di Trieste, I-34149 Trieste, Italy
- University of Udine, Department of Mathematics and Informatics, I-33100 Udine, Italy
| | - E Vannuccini
- INFN, Sezione di Florence, I-50019 Sesto Fiorentino, Florence, Italy
| | - G I Vasilyev
- Ioffe Physical Technical Institute, RU-194021 St. Petersburg, Russia
| | - S A Voronov
- National Research Nuclear University MEPhI, RU-115409 Moscow, Russia
| | - Y T Yurkin
- National Research Nuclear University MEPhI, RU-115409 Moscow, Russia
| | - G Zampa
- INFN, Sezione di Trieste, I-34149 Trieste, Italy
| | - N Zampa
- INFN, Sezione di Trieste, I-34149 Trieste, Italy
| | - M S Potgieter
- Centre for Space Research, North-West University, 2520 Potchefstroom, South Africa
| | - E E Vos
- Centre for Space Research, North-West University, 2520 Potchefstroom, South Africa
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Adriani O, Barbarino GC, Bazilevskaya GA, Bellotti R, Boezio M, Bogomolov EA, Bongi M, Bonvicini V, Bottai S, Bruno A, Cafagna F, Campana D, Carlson P, Casolino M, Castellini G, Donato CD, Santis CD, Simone ND, Felice VD, Formato V, Galper AM, Karelin AV, Koldashov SV, Koldobskiy S, Krutkov SY, Kvashnin AN, Leonov A, Malakhov V, Marcelli L, Martucci M, Mayorov AG, Menn W, Mergè M, Mikhailov VV, Mocchiutti E, Monaco A, Mori N, Munini R, Osteria G, Palma F, Panico B, Papini P, Pearce M, Picozza P, Ricci M, Ricciarini SB, Sarkar R, Scotti V, Simon M, Sparvoli R, Spillantini P, Stozhkov YI, Vacchi A, Vannuccini E, Vasilyev G, Voronov SA, Yurkin YT, Zampa G, Zampa N, Potgieter MS, Vos EE. TIME DEPENDENCE OF THEe−FLUX MEASURED BYPAMELADURING THE 2006 JULY–2009 DECEMBER SOLAR MINIMUM. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/0004-637x/810/2/142] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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