Nonthermal line broadening at solar flare footpoints is primarily field-aligned, demonstrated by systematic decrease in line widths from disk center to limb across 4,593 Hinode/EIS spectra from 407 flares.
Stochastic Acceleration by Turbulence
3 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
The subject of this paper is stochastic acceleration by plasma turbulence, a process akin to the original model proposed by Fermi. We review the relative merits of different acceleration models, in particular the so called first order Fermi acceleration by shocks and second order Fermi by stochastic processes, and point out that plasma waves or turbulence play an important role in all mechanisms of acceleration. Thus, stochastic acceleration by turbulence is active in most situations. We also show that it is the most efficient mechanism of acceleration of relatively cool non relativistic thermal background plasma particles. In addition, it can preferentially accelerate electrons relative to protons as is needed in many astrophysical radiating sources, where usually there are no indications of presence of shocks. We also point out that a hybrid acceleration mechanism consisting of initial acceleration by turbulence of background particles followed by a second stage acceleration by a shock has many attractive features. It is demonstrated that the above scenarios can account for many signatures of the accelerated electrons, protons and other ions, in particular $^3$He and $^4$He, seen directly as Solar Energetic Particles and through the radiation they produce in solar flares.
years
2026 3verdicts
UNVERDICTED 3representative citing papers
Reconnection injects suprathermal protons during cosmological magnetogenesis yielding a ~10^{-7} nonthermal energy fraction that provides only a minor seed for later shock acceleration.
This review summarizes the basic principles of electron transport in inhomogeneous and tangled magnetic fields through gyro-centre trajectories, kinetic instabilities, trapping, and diffusion processes.
citing papers explorer
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Nonthermal line broadening at solar flare footpoints is primarily field-aligned
Nonthermal line broadening at solar flare footpoints is primarily field-aligned, demonstrated by systematic decrease in line widths from disk center to limb across 4,593 Hinode/EIS spectra from 407 flares.
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Reconnection-Driven Injection and Stochastic Reacceleration during Cosmological Magnetogenesis
Reconnection injects suprathermal protons during cosmological magnetogenesis yielding a ~10^{-7} nonthermal energy fraction that provides only a minor seed for later shock acceleration.
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Transport of electrons in tangled magnetic fields
This review summarizes the basic principles of electron transport in inhomogeneous and tangled magnetic fields through gyro-centre trajectories, kinetic instabilities, trapping, and diffusion processes.