Unexpected cyclic behavior in cosmic ray protons observed by PAMELA at 1 AU
Space Physics
2018-01-26 v1 Earth and Planetary Astrophysics
Solar and Stellar Astrophysics
Abstract
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 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.
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Cite
@article{arxiv.1801.08418,
title = {Unexpected cyclic behavior in cosmic ray protons observed by PAMELA at 1 AU},
author = {O. Adriani and G. C. Barbarino and G. A. Bazilevskaya and R. Bellotti and M. Boezio and E. A. Bogomolov and M. Bongi and V. Bonvicini and A. Bruno and F. Cafagna and D. Campana and P. Carlson and M. Casolino and G. Castellini and C. De Santis and V. Di Felice and A. M. Galper and A. V. Karelin and S. V. Koldashov and S. Koldobskiy and S. Y. Krutkov and A. N. Kvashnin and A. Leonov and V. Malakhov and L. Marcelli and M. Martucci and A. G. Mayorov and W. Menn and M. Mergè and V. V. Mikhailov and E. Mocchiutti and A. Monaco and N. Mori and R. Munini and G. Osteria and B. Panico and P. Papini and M. Pearce and P. Picozza and G. Pizzella and M. Ricci and S. B. Ricciarini and M. Simon and R. Sparvoli and P. Spillantini and Y. I. Stozhkov and A. Vacchi and E. Vannuccini and G. Vasilyev and S. A. Voronov and Y. T. Yurkin and G. Zampa and N. Zampa},
journal= {arXiv preprint arXiv:1801.08418},
year = {2018}
}
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article 4 figures, 1 table