A1 Refereed original research article in a scientific journal
Toward a Realistic Evaluation of Transport Coefficients in Non-equilibrium Space Plasmas
Authors: Husidic Edin, Scherer Klaus, Lazar Marian, Fichtner Horst, Poedts Stefaan
Publisher: IOP Publishing Ltd
Publication year: 2022
Journal: Astrophysical Journal
Journal name in source: ASTROPHYSICAL JOURNAL
Journal acronym: ASTROPHYS J
Article number: 159
Volume: 927
Issue: 2
Number of pages: 10
ISSN: 0004-637X
eISSN: 1538-4357
DOI: https://doi.org/10.3847/1538-4357/ac4af4
Web address : https://iopscience.iop.org/article/10.3847/1538-4357/ac4af4
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/175026871
Preprint address: https://arxiv.org/abs/2201.05157
Recent studies have outlined the interest for the evaluation of transport coefficients in space plasmas, where the observed velocity distributions of plasma particles are conditioned not only by the binary collisions, e.g., at low energies, but also by the energization of particles from their interaction with wave turbulence and fluctuations, generating the suprathermal kappa-distributed populations. This paper provides a first estimate of the main transport coefficients based on regularized kappa distributions, which, unlike standard kappa distributions (SKDs), enable macroscopic parameterization without mathematical divergences or physical inconsistencies. All transport coefficients derived here, i.e., the diffusion and mobility coefficients, electric conductivity, thermoelectric coefficient, and thermal conductivity, are finite and well defined for all values of kappa > 0. Moreover, for low values of kappa (i.e., below the SKD poles), the transport coefficients can be orders of magnitudes higher than the corresponding Maxwellian limits, meaning that significant underestimations can be made if suprathermal electrons are ignored.
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