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Intense geomagnetic storms are characterized by a minimum value of the Dstindex at or below -100 nT. It is well known that these storms are caused by thesouthward magnetic fields in coronal mass ejections (CMEs) and corotatinginteraction regions (CIRs). While CIR storms are confined to Dst values at orabove -150 nT, CME storms can reach Dst -500 nT or lower. In this report, weillustrate the need to understand the storm evolution based on solar source andsolar wind parameters using a recent storm (2023 April 24) by way of providingthe motivation to catalog such events for a better understanding of the mainphase time structure of geomagnetic storms

Intense Geomagnetic Storms during Solar Cycles 23-25