Radial Evolution of CME-associated Particle Acceleration Observed by Solar Orbiter and ACE

The current wealth of spacecraft at various locations around the Sun allows for the study of the propagation of solar wind transients, as well as the processes that govern the acceleration of particles in the inner heliosphere. On 2022 March 10, a Coronal Mass Ejection (CME) was detected by Solar Orbiter. Data from Solar Orbiter at 0.45 au showed dispersive solar energetic particle signatures, as well as locally accelerated particles near the CME-associated shock structure as it passed by the spacecraft on 2022 March 11. This shock was later detected on 2022 March 14 by ACE, which was radially aligned with Solar Orbiter. Given the distance of ACE at 1 au, 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. Such multi-point observations provide insight regarding the various mechanisms of acceleration of energetic particles in the inner heliosphere between 0.45 and 1 au.