Authors: Malik H. Walker (Johns Hopkins University), Robert C. Allen(Johns Hopkins- Applied Physics Laboratory), Gang Li (University of California, Riverside), Athanasios Kouloumvakos (Johns Hopkins- Applied Physics Laboratory), George C. Ho (Johns Hopkins- Applied Physics Laboratory), Glenn M. Mason (Johns Hopkins- Applied Physics Laboratory), Javier Rodríguez-Pacheco (University of Alcalá), Robert F. Wimmer-Schweingruber (University of Kiel)

On 2022 March 10, a Coronal Mass Ejection (CME) was detected by Solar Orbiter at 0.45 au. This CME was later detected on 2022 March 14 by ACE at a distance of 1 au. At both spacecraft, dispersive solar energetic particle signatures were detected, as well as locally accelerated particles near the CME-associated shock structure. Since ACE was radially aligned with Solar Orbiter, this event provides a prime opportunity to better understand the radial evolution of CME shock-associated particle acceleration. Additionally, ion composition data from both spacecraft— via the Solar Orbiter Energetic Particle Detector/ Suprathermal Ion Spectrograph (EPD/SIS) and the Ultra Low Energy Isotope Spectrometer (ULEIS) on ACE— allows for in-depth analysis of the radial evolution of CME-associated species-dependent acceleration processes for this event. The results of this analysis suggest a variation in shock acceleration efficiency between 0.45 and 1 au. To further probe acceleration mechanisms within the inner heliosphere, the conclusions taken from the case study will also be discussed in the context of an ongoing statistical framework. Through the statistical use of multi point observations of CMEs, better constraints on the overall effects and dependencies of associated particle acceleration mechanisms can be determined.