De Franceschi, G., and A. De Santis. “PASHA: Regional Long-Term Predictions of Ionospheric Parameters by ASHA”. Annals of Geophysics 37, no. 2 (November 25, 1994). Accessed October 18, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4228.