TL;DRAbstract
Calculations and experiments have shown that some fraction of an electron stream incident on a gas is scattered in the backward direction. Applied to the aurora we find that about 15 to 20 percent of the electron flux returns up the field lines. These electrons are transferred to the conjugate region via the lines of force, if these are continuous between hemispheres. Losses are negligible, but a small drift in longitude may be expected. The energy spectrum of the electrons becomes softer; however, a close correspondence in occurrence of aurora must prevail. Absence of aurora would be a clear indication that the phenomenon is not associated with closed magnetic shells. A minor effect on the spectral character of the electrons scattered into the conjugate area is found, which could be associated with a difference in the model atmosphere and ionosphere.
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Calculations and experiments have shown that some fraction of an electron stream incident on a gas is scattered in the backward direction. Applied to the aurora we find that about 15 to 20 percent of the electron flux returns up the field lines. These electrons are transferred to the conjugate region via the lines of force, if these are continuous between hemispheres. Losses are negligible, but a small drift in longitude may be expected. The energy spectrum of the electrons becomes softer; however, a close correspondence in occurrence of aurora must prevail. Absence of aurora would be a clear indication that the phenomenon is not associated with closed magnetic shells. A minor effect on the spectral character of the electrons scattered into the conjugate area is found, which could be associated with a difference in the model atmosphere and ionosphere.
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