Abstract Title: *
Early-Stage SEP Acceleration by CME-Driven Shocks with Realistic Seed Spectra

Institution: *
Institute for Astronomy and NAO, BAS

Authors: *
Kamen Kozarev, Maher A. Dayeh, Ashraf Farahat

Preferred format: *
Oral

Abstract Text: *
An outstanding issue in heliospheric physics is understanding the acceleration of solar energetic
particles (SEP) in coronal mass ejections (CMEs) and flares. A recent question is whether the
acceleration occurs in interplanetary space (as has been accepted historically), or near the Sun.
Recent work has shown that CME-driven shocks may produce SEPs during the early stages of
eruptions, below 5 solar radii. In this work we explore SEP acceleration during the onset of
CMEs and shocks even lower in the corona, using realistic suprathermal spectra, for a selection
of events. We have calculated quiet-time, pre-event suprathermal particle spectra from 1 AU
observations, and scaled them back to the low corona to serve as seed spectra. For each event,
AIA observations and the CASHeW framework were used to model the compressive/shock
wave kinematics and its interaction with the corona. The proton acceleration was then modeled
using an analytic diffusive shock acceleration model as the shock waves propagate to 2 solar
radii. We compare the results with the observed SEP fluxes at 1 AU.