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The solar corona between below 10 solar radii is an important region for early acceleration and transport of solar energetic particles (SEPs) by coronal mass ejection-driven shock waves. There, these waves propagate into a highly variable dynamic medium with steep gradients and rapidly expanding coronal magnetic fields, which modulates the particle acceleration near the shock/wave surfaces, and the way SEPs spread into the heliosphere. We present a study modeling the acceleration of SEPs in global coronal shock events in the corona, as well as their transport to 1 au, based on telescopic observations coupled with dynamic physical models. As part of the project Solar Particle Radiation Environment Analysis and Forecasting—Acceleration and Scattering Transport (SPREAdFAST), we model the interaction of observed off-limb coronal bright fronts (CBF) with the coronal plasma from synoptic magnetohydrodynamic (MHD) simulations. We then simulate the SEP acceleration in analytical diffusive shock acceleration (DSA) model. The simulated fluxes are used as time-dependent inner boundary conditions for modeling the particle transport to 1 au. Resulting flux time series are compared with 1 au observations for validation. We summarize our findings and present implications for nowcasting SEP acceleration and heliospheric connectivity.

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The significance of the solar radio burst signatures for the solar energetic particle (SEP) classification is investigated in the current report. The solar radio bursts associated with the proton-producing solar flares and coronal mass ejections are usually of types II, III and IV. Based on the solar radio burst occurrences in different wavelength ranges, several categories for the SEP origin are adopted. This study evaluates the statistical differences in the flare and CME event samples related to each of these proton categories: flare-driven, CME-driven and mixed-contribution.

The 12-th Workshop "Solar Influences on the Magnetosphere, Ionosphere and Atmosphere" was scheduled to be held from June 3 to 7, 2020 in Primorsko, Bulgaria. Due to the coronavirus pandemic, the Local Organizing Committee decided to postpone the workshop until September. Unfortunately, in September the situation was not better, and it was not possible to hold a face-to-face meeting. Therefore, the workshop was held online. 24 papers with a total of 76 authors from 11 countries are included in these Proceedings.

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