Abstract
Auroral luminosities of the main emission lines in the aurora have been calculated for excitation by an isotopic primary electron flux with spectra of the form J(E) = AE exp (−EE1) + B(E2)E exp (−EE1). The variation of emissions from O and N2+ with height are shown, as are the variations of column integrated intensities and pertinent intensity ratios with the characteristic energy E2, this leading to a method of estimating the electron spectrum from ground observation.
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