Authors: Wenwen Wei(Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA), Christina O. Lee(Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA), Janet G. Luhmann(Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA), M. Leila Mays(2Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA)

The May 2024 geostorm event, which is characterized by complex interplanetary structures near Earth, led to the strongest geomagnetic storm in over two decades. The source active region, AR 13664, was exceptionally active and produced a series of successive halo coronal mass ejections (CMEs), resulting in multiple complex solar energetic particle (SEP) events during May 8-14, 2024. Differentiating the contributions of various CMEs to the multiple SEP events is essential for understanding the sources of the complex SEP profiles. Therefore, by leveraging the numerical models and in situ data analysis, we investigate how successive CME eruptions modified the SEP transport. We further identify the role of magnetic connectivity between CME-driven shocks and SEP events and determine the CME contributions to the overall SEP profiles. The CMEs and SEP events are simulated with the coupled WSA-Enlil + Cone model and the SEPMOD energetic particle transport code, respectively. This study includes our analysis of the modeled SEP time profiles and solar wind conditions. We also compare these results with in-situ observations at Earth and STEREO A.