Improvements in Electron Density Definition in Autoscala Program

A sketch of the Ne(h) model used by AIP is reported in Fig. 1. The model is based on the definition of some anchor points, which are reported in Fig.1 as A, B, C, D, E, and F. In the previous version, the point D was assumed according to [1] model, in which the height (δhvE[base]), and the depth (δhvE[base]) of E valley were computed by polynomial with the solar zenith angle χ as variable. In this version the D point is: hvE = hmE[base] + hdeepE[base], where hdeepE[base and hdeepE[base] are assumed in a similar way to IRI model.