Super-Fermi acceleration in multiscale MHD reconnection

Majeski, Stephen; Ji, Hantao

doi:10.1063/5.0139276

Title: Super-Fermi acceleration in multiscale MHD reconnection

Journal Article · Mon Apr 10 00:00:00 EDT 2023 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0139276· OSTI ID:1974418

^[1];

^[2]

Princeton University, NJ (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

We investigate the Fermi acceleration of charged particles in 2D MHD anti-parallel plasmoid reconnection, finding a drastic enhancement in energization rate [Formula: see text] over a standard Fermi model of [Formula: see text]. The shrinking particle orbit width around a magnetic island due to [Formula: see text] drift produces a [Formula: see text] power law with [Formula: see text]. The increase in the maximum possible energy gain of a particle within a plasmoid due to the enhanced efficiency increases with the plasmoid size and is by multiple factors of 10 in the case of solar flares and much more for larger plasmas. Including the effects of the non-constant [Formula: see text] drift rates leads to further variation in power law indices from [Formula: see text] to [Formula: see text], decreasing with plasmoid size at the time of injection. The implications for energetic particle spectra are discussed alongside applications to 3D plasmoid reconnection and the effects of a guide field.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: AC02-09CH11466; 80HQTR21T0060

OSTI ID:: 1974418

Alternate ID(s):: OSTI ID: 1968916

Journal Information:: Physics of Plasmas, Vol. 30, Issue 4; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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