Magnetically trapped leptons with E>200 MeV in near Earth belts with the AMS experiment

Details Magnetically trapped leptons with E>200 MeV in near Earth belts with the AMS experiment Magnetically trapped leptons with E>200 MeV in near Earth belts with the AMS experiment

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.4007f&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

Accurate measurements of electron and positron fluxes in the energy range 0.2-10 GeV have been performed with the Alpha Magnetic Spectometer (AMS) at altitudes of 370-390 km in the geographic latitude interval ±51.7° . We describe the observed under-cutoff lepton fluxes outside the region of the South Atlantic Anomaly (SAA). The separation into quasi-trapped, long lifetime (> 1 s), and albedo, short lifetime (< 300 ms), components is explained in terms of the drift shell populations observed by the AMS. The flux distributions as a function of the canonical adiabatic variables L, αo are presented for the interval 0.95< L <3, 0o < αo <90o for electrons (E<10 GeV), and positrons E(<3 GeV). The results are compared with existing data at lower energies. The properties of the observed under-cutoff particles are also investigated in terms of their residence times and geographical origin.

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