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- W2894202064 abstract "The Galaxy is filled with cosmic-ray particles, mostly protons with kinetic energies greater than hundreds of MeV. Around Earth, trapped energetic protons, electrons and other particles circulate at altitudes from about 500 to 40,000 kilometers in the Van Allen radiation belts. Soon after these radiation belts were discovered six decades ago, it was recognized that the main source of inner-belt protons (with kinetic energies at and greater than tens to hundreds of MeV) is cosmic-ray albedo neutron decay (CRAND). In this process, cosmic rays that reach the upper atmosphere interact with neutral atoms to produce albedo neutrons, which, being prone to s-decay, are a possible source of geomagnetically trapped protons and electrons. These protons would retain most of the kinetic energy of the neutrons, while the electrons would have lower energies, mostly less than one MeV. The viability of CRAND as an electron source has, however, been uncertain, because measurements have shown that the electron intensity in the inner Van Allen belt can vary greatly, while the neutron-decay rate should be almost constant. Here we show direct measurements of relativistic electrons near the inner edge of the inner radiation belt, where only quasi-trapped population exist, made by Colorado Student Space Weather Experiment (CSSWE)/Relativistic Electron and Proton Telescope integrated little experiment (REPTile). We demonstrate that the main source of these electrons is indeed CRAND, and that this process also contributes to electrons elsewhere [1]." @default.
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- W2894202064 date "2018-05-01" @default.
- W2894202064 modified "2023-10-18" @default.
- W2894202064 title "Quantitative Assessment of CRAND Contribution to the Relativistic Electrons in the Inner Belt and Slot Region" @default.
- W2894202064 doi "https://doi.org/10.23919/ursi-at-rasc.2018.8471440" @default.
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