The study of topside ionospheric irregularities during geomagnetic storms in 2015

In this study, the variations of topside ionospheric irregularities during 24 geomagnetic storms with Dst ≤ −50 nT in 2015 were examined through an algorithm specifically designed to detect a significant level irregularities. The was developed use several parameters derived from total electron content (TEC) observations GRACE, Swarm-C, and Swarm-B. local time characteristics observed equatorial plasma (EPIs) analyzed different phases storms, within 30° S–30° N magnetic latitudes. By comparing its results corresponding in-situ density data previous studies, found be efficient. It that detected EPIs at stages storm showed dependence. For instance, nighttimes, but took place daytime occasionally main phase. Furthermore, percentage occurrence rates most prominent phase post-sunset sector less than 6 h onset. On other hand, became post-midnight/morning recovery even higher sector. Based on these findings it concluded dominant driver enhanced post-midnight/daytime could associated disturbance dynamo electric fields.