Global Ionospheric Response to the Geomagnetic Storms from March to April 2023

Abstract This article uses global ionospheric data provided by IGS and employs the sliding quartile range method to study the ionospheric disturbances during two times geomagnetic storms that occurred in March and April 2023. The results are as follows. Coronal mass ejections are the primary cause of geomagnetic disturbances. When combined with factors such as dark stripe bursts, they enhance the intensity of geomagnetic storms and cause significant differences in the occurrence and distribution characteristics of ionospheric TEC disturbances. The ionospheric disturbance during the geomagnetic period in March shows an asymmetric distribution in an east-west direction, while the entire process of ionospheric disturbance during the geomagnetic period in April exhibits a transition from positive phase disturbance to negative phase disturbance. In addition, the ionospheric TEC in the northern hemisphere of the East Asia Australia (120 ° E) line is significantly higher than that in the southern hemisphere. The amplitude changes of ionospheric disturbances are most significant during the recovery phase of geomagnetic storms, showing a distribution pattern of low latitude positive disturbances and mid high latitude negative disturbances.