Sources of Solar Energetic Particles

Abstract

Solar Energetic Particles (SEP) are an integral part of the physical processes related with Space Weather. We present a review for the acceleration mechanisms related to the explosive phenomena (flares and/or CMEs) inside the solar corona. For more than 40 years, the main 2D cartoon representing our understanding of the explosive phenomena inside the solar corona remained almost unchanged. The acceleration mechanisms related to solar flares and CMEs also remained unchanged and were part of the same cartoon. In this review, we revise the standard cartoon and present evidence from recent global MHD simulations that supports the argument that explosive phenomena will lead to the spontaneous formation of current sheets in different parts of the erupting magnetic structure. The evolution of the large scale current sheets and their fragmentation will lead to strong turbulence and turbulent reconnection during solar flares and turbulent shocks. In other words, the acceleration mechanism in flares and CME-driven shocks may be the same, and their difference will be the overall magnetic topology, the ambient plasma parameters, and the duration of the unstable driver.

Accepted at Philosophical Transactions A, 2019

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Cited by in corpus (5)

• Observation and Modeling of Solar Jets
• CME Magnetic Structure and IMF Preconditioning Affecting SEP Transport
• Test particle energization of heavy ions in magnetohydrodynamic turbulence
• Introduction to the physics of solar eruptions and their space weather impact
• The magnetic field environment of active region 12673 that produced the energetic particle events of September 2017