Towards a realistic evaluation of transport coefficients in non-equilibrium space plasmas. (arXiv:2201.05157v1 [physics.plasm-ph])
<a href="http://arxiv.org/find/physics/1/au:+Husidic_E/0/1/0/all/0/1">Edin Husidic</a>, <a href="http://arxiv.org/find/physics/1/au:+Scherer_K/0/1/0/all/0/1">Klaus Scherer</a>, <a href="http://arxiv.org/find/physics/1/au:+Lazar_M/0/1/0/all/0/1">Marian Lazar</a>, <a href="http://arxiv.org/find/physics/1/au:+Fichtner_H/0/1/0/all/0/1">Horst Fichtner</a>, <a href="http://arxiv.org/find/physics/1/au:+Poedts_S/0/1/0/all/0/1">Stefaan Poedts</a>
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 energisation 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 regularised Kappa distributions (RKDs), which,
unlike standard Kappa distributions (SKDs), enable macroscopic parameterisation
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.
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 energisation 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 regularised Kappa distributions (RKDs), which,
unlike standard Kappa distributions (SKDs), enable macroscopic parameterisation
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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