3 years ago

Unexpected cyclic behavior in cosmic ray protons observed by PAMELA at 1 AU.

M. Martucci, P. Picozza, W. Menn, S. A. Voronov, D. Campana, N. Zampa, V. Malakhov, P. Spillantini, L. Marcelli, F. Cafagna, E. A. Bogomolov, G. Pizzella, M. Casolino, G. Zampa, P. Papini, R. Sparvoli, A. M. Galper, A. Leonov, R. Munini, A. Vacchi, R. Bellotti, M. Mergè, E. Mocchiutti, V. V. Mikhailov, A. G. Mayorov, G. C. Barbarino, A. V. Karelin, P. Carlson, G. Osteria, Y. I. Stozhkov, V. Bonvicini, M. Pearce, N. Mori, A. Monaco, V. Di Felice, M. Boezio, A. N. Kvashnin, A. Bruno, M. Bongi, S. Y. Krutkov, Y. T. Yurkin, M. Ricci, S. V. Koldashov, G. A. Bazilevskaya, S. B. Ricciarini, S. Koldobskiy, G. Vasilyev, G. Castellini, O. Adriani, B. Panico, M. Simon, C. De Santis, E. Vannuccini

Protons detected by the PAMELA experiment in the period 2006-2014 have been analyzed in the energy range between 0.40-50 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 $\sim$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.

Publisher URL: http://arxiv.org/abs/1801.08418

DOI: arXiv:1801.08418v1

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