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