Fig. 4From: GPS and in situ Swarm observations of the equatorial plasma density irregularities in the topside ionosphereLongitudinal distribution of density irregularities occurrence probability derived from the ROTI and RODI values for SWA/SWB satellites for equinox seasons: a September 2014, b March 2015 and c September 2015. Results are presented for post-sunset (left panel) and post-midnight (right panel) time. Black thin line depicts the geomagnetic equator. Empty cells are marked by white color Back to article page