Speaker
Description
Solar energetic particles (SEPs), accelerated by solar flares and interplanetary shocks, can penetrate the Earth's atmosphere, producing ion pairs and contributing to the generation of reactive species such as NOx and HOx. These processes play a role in atmospheric chemistry and are considered part of the broader category of solar forcing.
As such, SEPs are included in the Coupled Model Intercomparison Project Phase 7 (CMIP7), a major international climate modeling initiative aimed at improving our understanding of past, present, and future climate change. In this presentation, we provide an overview of the updates made to the SEP-induced ionization (II) dataset for CMIP7.
Initially, our goal was to extend the CMIP6 SEP II time series beyond 2020 using new data from the GOES-R satellite series. However, the effort evolved into a comprehensive re-evaluation of the SEP II input used in CMIP6. Key improvements include the inclusion of higher-energy SEP particles and the removal of non-SEP background signals, resulting in a more physically accurate dataset.
To calculate ionization rates as a function of atmospheric altitude, we employed a recently published hybrid method. This approach combines Monte Carlo simulations—used to model particle interactions in the mid and lower atmosphere—with analytical solutions tailored for very low-pressure regions in the upper atmosphere.
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