Speaker
Description
First Name: David
Last Name: Lario
Affiliation: Heliophysics Science Division, NASA/GSFC
All Authors: D. Lario, A. Niemela, B. Sanchez-Cano, M. Pinto, G. M. Mason, R. Y. Kwon, L.A. Balmaceda, F. Carcaboso, I. G. Richardson, V. Krupar, J. C. Martinez-Oliveros, S. Wallace, D. da Silva, N. Wijsen, W. Liu, L. Y. Khoo, J. L. Pellon-Bailon, P. Kuhl, R. F. Wimmer-Schweingruber, F. Espinosa Lara, I. Cernuda, A. Aran, R. Prat, J. Rodriguez-Pacheco, G.C. Ho, E. Riihonen, R. Vainio, C. O. Lee, P. Kollmann, P. Peplowski, J. Goldsten, T. S. Horbury, H. O’Brien, A. Crabtree, J. Morris
Abstract: We present a comprehensive multi-spacecraft analysis of the most intense solar energetic particle (SEP) event observed to date by the Solar Orbiter mission. The event occurred on 2025 August 21 and produced multiple single-event upsets (SEUs) in spacecraft systems. We characterize the temporal and spatial evolution of the SEP event at several heliospheric locations where the event was detected, including Solar Orbiter, Parker Solar Probe, BepiColombo, STEREO-A, MAVEN, JUICE, Europa Clipper, and near-Earth missions. We compare Error Detection And Correction (EDAC) data from several Solar Orbiter subsystems with the energetic particle measurements. The exceptionally broad longitudinal extent of the event qualifies it as a circumsolar SEP event, and provides a unique opportunity to investigate the roles of CME-driven shocks, magnetic connectivity, and coronal and heliospheric particle transport processes. We combine these observations with global MHD simulations of the contextual interplanetary medium and the CME-driven shock propagation, together with physics-based energetic particle transport modeling, to reconstruct the multi-spacecraft particle observations. We analyze the mechanisms contributing to the wide spatial spread of particles, enabling the event to achieve circumsolar reach.