Speaker
Description
Solar energetic particles (SEPs) are typically accelerated during solar eruptions and propagate along magnetic field lines in the inner heliosphere. These eruptions include shockwaves driven by coronal mass ejections (CMEs) and magnetic reconnection in solar flares. Since spacecraft rarely reach the acceleration regions close to the Sun, measured SEP intensities reflect a combination of acceleration, injection, and interplanetary transport.
This study characterizes the longitudinal spread of the SEP event on 28 May 2021 by fitting Gaussian curves at regular time intervals to particle intensities as a function of spacecraft position. This offers unprecedented detail compared to earlier studies, which were limited to only three observers, while we now benefit from a novel fleet: including Solar Orbiter, Parker Solar Probe (PSP), STEREO-A, Wind, and SOHO.
To support the interpretation of the evolving profiles, we use a 2D SEP transport model to infer the particle acceleration parameters.
Through this approach, we aim to better identify signatures associated with the two main acceleration phenomena: solar flares and CME-driven shockwaves and characterize transport effects.
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