Work

Revisiting kinetic electrostatic electron non-linear (KEEN) waves in the presence of dynamical ions

Year: 2026

Type: preprint

Abstract: We revisit the kinetic electrostatic electron nonlinear (KEEN) waves studied by Afeyan et. al in 2014 using a hybrid flow-mapping strategy that combines the characteristic mapping method (CMM) with numerical flow iteration (NuFi). The study extends the classical setup to dynamical ions, comparing their impact on the long-time KEEN dynamics with the static-ion case. To this end, we extend the CMM-NuFI framework with a multi-map strategy, assigning one map to the ion and one to the electron characteristic flow. The resulting problem exhibits a wide separation of spatial and temporal scales, driven by the fine structures generated by the ponderomotive force and by the large ion-to-electron mass ratio, which renders it computationally prohibitive for conventional grid-based methods. Our multi-map CMM-NuFI method efficiently resolves these disparate scales, enabling long-time simulations of KEEN dynamics with fully dynamical ions.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.04941

Authors: Wilhelm, Rostislav-Paul, Krah, Philipp, Schneider, Kai, Bacchini, Fabio, Grandgirard, Virginie

Institutions: KU Leuven, CEA Cadarache, Institut de Recherche sur la Fusion par confinement Magnétique, Centre National de la Recherche Scientifique, Aix-Marseille Université, Institut de Mathématiques de Marseille, Royal Belgian Institute for Space Aeronomy

Language: English

Topic: Dust and Plasma Wave Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Belgian Federal Science Policy Office, Fonds Wetenschappelijk Onderzoek, Vlaamse regering

Awards: Multi-scale modeling of solar wind expansion, acceleration, and turbulence, G678227846

OpenAlex ID: W7211867493

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