Responses of the topside ion fractions concentration over the Arecibo Observatory to solar and geomagnetic activity for the summer period

In this work, we are analyzing incoherent scatter radar (ISR) data for H+, He+, and O+ ion fractions from the Arecibo Observatory for the period of June solstice (May, June, July, and August) for 1998 and 2000 with respect to solar flux and geomagnetic variations. Due to the strait dependence of the response of the ion fractions with the mentioned forcing, we isola...