Abstract
Using topside electron density measurements (Ne) recorded over Nicosia (geographic coordinates: 35.14°N, 33.2°E) and Moscow (geographic Lat: 55.50 °N, Long: 37.30 °E) we investigate the latitudinal variation of topside electron density during 2020 encompassing a period of low solar activity. The selected topside electron density dataset employed in this study is based on in-situ Langmuir probe data on board European Space Agency (ESA) Swarm satellites, in the vicinity of Nicosia and Moscow combined with coincident NmF2 values from the Digisondes at the two locations. Our investigation demonstrates that the ratio Ne/NmF2 between coincident Swarm Ne and Digisonde NmF2 observations is higher than 1 on some occasions over Nicosia during nightime which is not the case over Moscow signifying a latitude based feature of Ne at Swarm altitudes worth exploring further.
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