Abstract
Calculations of the λ3914 emission rate due to solar cosmic ray bombardment, based on exponential rigidity spectra for solar protons and alpha particles, are compared with spectrographic observations from the polar regions during PCA events. While limited data on the time variations of polar-glow aurora agree with predictions from observations of solar cosmic ray fluxes, the observed emission rates exceed calculated values by about an order of magnitude. The bearing of these results on the PCA problem is discussed.
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