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Title: TRAPPED PROTON FLUXES AT LOW EARTH ORBITS MEASURED BY THE PAMELA EXPERIMENT

We report an accurate measurement of the geomagnetically trapped proton fluxes for kinetic energy above ∼70 MeV performed by the PAMELA mission at low Earth orbits (350 ÷ 610 km). Data were analyzed in the frame of the adiabatic theory of charged particle motion in the geomagnetic field. Flux properties were investigated in detail, providing a full characterization of the particle radiation in the South Atlantic Anomaly region, including locations, energy spectra, and pitch angle distributions. PAMELA results significantly improve the description of the Earth's radiation environment at low altitudes, placing important constraints on the trapping and interaction processes, and can be used to validate current trapped particle radiation models.
Authors:
;  [1] ;  [2] ;  [3] ; ;  [4] ; ; ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ; ; ; ; ;  [11] ;  [12] more »; « less
  1. Department of Physics and Astronomy, University of Florence, I-50019 Sesto Fiorentino, Florence (Italy)
  2. Department of Physics, University of Naples "Federico II," I-80126 Naples (Italy)
  3. Lebedev Physical Institute, RU-119991 Moscow (Russian Federation)
  4. Department of Physics, University of Bari, I-70126 Bari (Italy)
  5. INFN, Sezione di Trieste, I-34149 Trieste (Italy)
  6. Ioffe Physical Technical Institute, RU-194021 St. Petersburg (Russian Federation)
  7. INFN, Sezione di Florence, I-50019 Sesto Fiorentino, Florence (Italy)
  8. INFN, Sezione di Bari, I-70126 Bari (Italy)
  9. INFN, Sezione di Naples, I-80126 Naples (Italy)
  10. KTH, Department of Physics, and the Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, SE-10691 Stockholm (Sweden)
  11. INFN, Sezione di Rome "Tor Vergata," I-00133 Rome (Italy)
  12. IFAC, I-50019 Sesto Fiorentino, Florence (Italy)
Publication Date:
OSTI Identifier:
22364520
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 799; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; CHARGED PARTICLES; COSMIC PROTONS; COSMIC RAY FLUX; ENERGY SPECTRA; GEOMAGNETIC FIELD; INCLINATION; KINETIC ENERGY; LIMITING VALUES; MEV RANGE; ORBITS; SPACE VEHICLES; TRAPPED PROTONS; TRAPPING