Protons in near earth orbit

J. Alcaraz, D. Alvisi, B. Alpat, G. Ambrosi, H. Anderhub, L. Ao, A. Arefiev, P. Azzarello, E. Babucci, L. Baldini, M. Basile, D. Barancourt, F. Barao, G. Barbier, G. Barreira, R. Battiston, R. Becker, U. Becker, L. Bellagamba, P. BénéJ. Berdugo, P. Berges, B. Bertucci, A. Biland, S. Bizzaglia, S. Blasko, G. Boella, M. Boschini, M. Bourquin, G. Bruni, M. Buenerd, J. D. Burger, W. J. Burger, X. D. Cai, R. Cavalletti, C. Camps, P. Cannarsa, M. Capell, D. Casadei, J. Casaus, G. Castellini, Y. H. Chang, H. F. Chen, H. S. Chen, Z. G. Chen, N. A. Chernoplekov, A. Chiarini, T. H. Chiueh, Y. L. Chuang, F. Cindolo, V. Commichau, A. Contin, A. CottaRamusino, P. Crespo, M. Cristinziani, J. P. Da Cunha

Research output: Contribution to journalArticlepeer-review

207 Scopus citations


The proton spectrum in the kinetic energy range 0.1 to 200 GeV was measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS-91 at an altitude of 380km. Above the geomagnetic cutoff the observed spectrum is parameterized by a power law. Below the geomagnetic cutoff a substantial second spectrum was observed concentrated at equatorial latitudes with a flux ~ 70m-2 s-1 sr-1. Most of these second spectrum protons follow a complicated trajectory and originate from a restricted geographic region. (C) 2000 Published by Elsevier Science B.V.

Original languageEnglish
Pages (from-to)215-226
Number of pages12
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
StatePublished - 13 Jan 2000


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