In this paper we examine the relationship among certain prominent auroral FUVV emission features, the incident electron spectrum, and the model neutral atmosphere. Given the neutral atmosphere we show that for simple models of the incident electron spectrum (Maxwellian and Gaussian in energy) satellite measurements of FUV emission features, in principle, determine the incident electron spectrum. We also discuss the relationship between the incident electron spectrum and the E region plasma density profile for the continuous (diffuse) aurora and for a stable arc.