Abstract
The Polar Cap Absorption (PCA) event effects of proton pitch angle variation caused by altitude variation of the Earth's magnetic field are shown to be small (a few per cent). Use of an atmospheric density model not appropriate for the time and location of the event is shown to cause errors of about a factor of two in computed ionization rates in some instances. A simple equation for determination of this relative atmospheric model effect for power law energy spectra is given.
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