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James A. Van Allen lab journal, March 1958-September 1959
Page 110
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neutrons at high altitudes into protons and electrons. Since "lifetime" of trapped particles in the earth's magnetic field is probably limited dominantly by scattering out of trapped orbits which are mirrored at high altitudes to ones less inclined to the magnetic lines -- which are therefore mirrored at lower altitudes and hence result in more rapid loss of energy by ionization —, protons probably a very much greater lifetime than electrons of comparable energy. The factor may well be of the order of mass ratio -- at least 2000 to one. In order that a particle, trapped in a Stoermer-Freiman lune, have a long life it should preferably be injected
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neutrons at high altitudes into protons and electrons. Since "lifetime" of trapped particles in the earth's magnetic field is probably limited dominantly by scattering out of trapped orbits which are mirrored at high altitudes to ones less inclined to the magnetic lines -- which are therefore mirrored at lower altitudes and hence result in more rapid loss of energy by ionization —, protons probably a very much greater lifetime than electrons of comparable energy. The factor may well be of the order of mass ratio -- at least 2000 to one. In order that a particle, trapped in a Stoermer-Freiman lune, have a long life it should preferably be injected
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