Anisotropy studies in the cosmic ray proton flux with the PAMELA experiment

Giaccari, U.; Adriani, O.; Barbarino, G. C.; Bazilevskaya, G. A.; Bellotti, R.; Bianco, A.; Boezio, M.; Bogomolov, E. A.; Bonechi, L.; Bongi, M.; Bonvicini, V.; Borisov, S.; Bottai, S.; Bruno, A.; Cafagna, F.; Campana, D.; Carbone, R.; Carlson, P.; Casolino, M.; Castellini, G.; De Pascale, M. P.; De Santis, C.; De Simone, N.; Di Felice, V.; Formato, Valerio; Galper, A. M.; Grishantseva, L.; Jerse, Giovanna; Karelin, A. V.; Kheymits, M. D.; Koldashov, S. V.; Krutkov, S. Y.; Kvashnin, A. N.; Leonov, A.; Malakhov, V.; Malvezzi, V.; Marcelli, L.; Martucci, M.; Mayorov, A. G.; Menn, W.; Mikhailov, V. V.; Mocchiutti, Emiliano; Monaco, A.; Mori, N.; Munini, Riccardo; Nikonov, N.; Osteria, G.; Palma, F.; Papini, P.; Pearce, M.; Picozza, P.; Pizzolotto, C.; Ricci, M.; Ricciarini, S. B.; Rossetto, L.; Sarkar, R.; Simon, M.; Sparvoli, R.; Spillantini, P.; Stozhkov, Y. I.; Vacchi, Andrea; Vannuccini, E.; Vasilyev, G.; Voronov, S. A.; Wu, J.; Yurkin, Y. T.; Zampa, G.; Zampa, N.; Zverev, V. G.

doi:10.1016/j.nuclphysbps.2013.05.020

Using data taken by the Pamela experiment during 5 years of operation we studied the anisotropy in the arrival direction distribution of cosmic ray protons with rigidity above 40 GV. In this survey we used two different and independent techniques to investigate the large and medium anisotropy patterns in the proton spectrum. With both methods the observed distribution of arrival directions is consistent with the isotropic expectation and no significant evidence of strong anisotropies has been observed.