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The Effect of Large-scale Magnetic Fluctuations on Energetic Particle Profiles across Interplanetary Shocks
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The Effect of Large-scale Magnetic Fluctuations on Energetic Particle Profiles across Interplanetary Shocks
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Journal Article
The Effect of Large-scale Magnetic Fluctuations on Energetic Particle Profiles across Interplanetary Shocks
2026
Overview
In situ observations of energetic particles associated with interplanetary (IP) shocks, known as energetic storm particle (ESP) events, often show time-intensity profiles quite different from predictions of classical diffusive shock acceleration theory. We use numerical simulations, including test-particle simulations and hybrid simulations (with fluid electrons and kinetic protons) for shocks propagating into a turbulent magnetic field to study the ESP intensity-time profiles across a strong IP shock. We find that several types of energetic particle intensity profiles similar to in situ observations can be produced in our simulations. The peak of energetic particle count is often near, but can be shifted from, the locations of the shock front, with the peak usually being observed downstream of the shock. These findings may help understand particle acceleration at both traveling IP shocks and shocks in other heliospheric and astrophysical environments.
Publisher
IOP Publishing
