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Updated: Oct 5, 2025

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
Published on: December 22, 2018
Kinetic Heating by Alfvén Waves in Magnetic Shears
Fabio Bacchini1, Francesco Pucci2, Francesco Malara3
1Centre for mathematical Plasma Astrophysics, Department of Mathematics, Katholieke Universiteit Leuven, Celestijnenlaan 200B, B-3001 Leuven, Belgium.
Abstract:
With first-principles kinetic simulations, we show that a large-scale Alfvén wave (AW) propagating in an inhomogeneous background decays into kinetic Alfvén waves (KAWs), triggering ion and electron energization. We demonstrate that the two species can access unequal amounts of the initial AW energy, experiencing differential heating. During the decay process, the electric field carried by KAWs produces non-Maxwellian features in the particle velocity distribution functions, in accordance with space observations. The process we present solely requires the interaction of a large-scale AW with a magnetic shear and may be relevant for several astrophysical and laboratory plasmas.
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