Authors: Jon Linker (PSI), Ronald Caplan (PSI),, Erika Palmerio (PSI),, Nathan Schwadron (UNH), Matthew Young (UNH), Tibor Torok (PSI), Cooper Downs (PSI), Christina Cohen (Cal Tech), & ISOIS Team

Solar Energetic Particles (SEPs) are typically associated with large solar eruptions. They are of fundamental scientific interest and can represent a significant space weather hazard as well. The unusually fast rise times of SEPs at locations distant from their apparent solar source that occurs in some events is a particularly puzzling phenomenon. The addition of PSP and Solar Orbiter to the list of spacecraft measuring SEPs offers new opportunities to investigate these events. These events are challenging to model, because they require a global description of SEP acceleration and transport in the solar corona and inner heliosphere. In this presentation, we describe Coupled MHD-Focused Transport simulations of two broad longitude events in the PSP/Solar Orbiter Era (the 11/29/2020 and 10/28/2021 flare/CME events) using the SPE Threat Assessment Tool (STAT, e.g., Young et al. ApJ 909, 2021). We discuss the possible role of large-scale separators and QSLs (the so-called S-Web)in the generation of SEPs at multiple heliospheric locations.

Research supported by NASA and NSF.