A solar activity correction term for the IRI topside electron density model

In situ measurements by the Low Earth Orbital (LEO) satellites, such as CHAMP, GRACE, and C/NOFS satellites have shown that International Reference Ionosphere (IRI) model has shortcomings in describing solar activity variation of topside electron density. particular IRI overestimates measured densities ionosphere during very low reached last minimum (2008–2009). We used Alouette ISIS sounder data well Swarm to deduce a correction term for density more accurately describes with activity. linear index PF10.7 described latitudinal altitudinal regression parameters A0 A1 (intercept slope). find good agreement between deduced from CHAMP GRACE observations. results show same structure other sets, however, scaling factor is needed obtain absolute values. The new was evaluated sounder, LEO showing significant improvement over current model.