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Unexpected Cyclic Behavior in Cosmic-Ray Protons Observed by PAMELA at 1 au

Adriani, O. (author)
Barbarino, G. C. (author)
Bazilevskaya, G. A. (author)
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Bellotti, R. (author)
Boezio, M. (author)
Bogomolov, E. A. (author)
Bongi, M. (author)
Bonvicini, V. (author)
Bruno, A. (author)
Cafagna, F. (author)
Campana, D. (author)
Carlson, Per (author)
KTH,Partikel- och astropartikelfysik
Casolino, M. (author)
Castellini, G. (author)
De Santis, C. (author)
Di Felice, V. (author)
Galper, A. M. (author)
Karelin, A. V. (author)
Koldashov, S. V. (author)
Koldobskiy, S. (author)
Krutkov, S. Y. (author)
Kvashnin, A. N. (author)
Leonov, A. (author)
Malakhov, V. (author)
Marcelli, L. (author)
Martucci, M. (author)
Mayorov, A. G. (author)
Menn, W. (author)
Merge, M. (author)
Mikhailov, V. V. (author)
Mocchiutti, E. (author)
Monaco, A. (author)
Mori, N. (author)
Munini, R. (author)
Osteria, G. (author)
Panico, B. (author)
Papini, P. (author)
Pearce, Mark, 1970- (author)
KTH,Partikel- och astropartikelfysik
Picozza, P. (author)
Pizzella, G. (author)
Ricci, M. (author)
Ricciarini, S. B. (author)
Simon, M. (author)
Sparvoli, R. (author)
Spillantini, P. (author)
Stozhkov, Y. I. (author)
Vacchi, A. (author)
Vannuccini, E. (author)
Vasilyev, G. (author)
Voronov, S. A. (author)
Yurkin, Y. T. (author)
Zampa, G. (author)
Zampa, N. (author)
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 (creator_code:org_t)
2018-01-09
2018
English.
In: Astrophysical Journal Letters. - : IOP PUBLISHING LTD. - 2041-8205 .- 2041-8213. ; 852:2
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Protons detected by the PAMELA experiment in the period 2006-2014 have been analyzed in the energy range between 0.40 and 50 GV to explore possible periodicities besides the well known solar undecennial modulation. An unexpected clear and regular feature has been found at rigidities below 15 GV, with a quasi-periodicity of similar to 450 days. A possible Jovian origin of this periodicity has been investigated in different ways. The results seem to favor a small but not negligible contribution to cosmic rays from the Jovian magnetosphere, even if other explanations cannot be excluded.

Subject headings

NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Keyword

cosmic rays
Sun: heliosphere

Publication and Content Type

ref (subject category)
art (subject category)

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