Authors: Arch Robison (Montana State University), Rachael Filwett (Montana State University)

Cosmogenic isotope records show nine short-term increases, known as Miyake Events, within the past 15,000 years, which may be the result of extreme solar particle events larger in magnitude than the Carrington Event of 1859. Understanding the frequency and characteristics of these events can help with risk assessment for future CMEs that would damage modern power & space infrastructure. We use high-altitude radiation dose maps from the NASA NAIRAS model to analyze the global distribution of 14C production in the stratosphere as a function of Kp index for recent geoeffective CMEs. These distributions are compared to the latitudinal variation in 14C enrichment in annually-dated tree rings. Back-calculating the Kp index of the Miyake Events will require further analysis of atmospheric transport and tree uptake for error tolerancing.