Gravitational filtering, magnetic-field inhomogeneity and Coulomb collisions in a kinetic model of a plasma atmosphere with stochastic heating at its base
Abstract
We investigate the effects of stochastic heating, magnetic inhomogeneity, and Coulomb collisions in coronal loops using a reduced kinetic model. Coulomb collisions thermalize suprathermal populations generated by intermittent heating and populate velocity-space regions inaccessible from the lower boundary in the collisionless limit. We consider two regimes: when heating varies faster than the electron crossing time, the plasma develops a multitemperature nonthermal distribution; when it varies more slowly than the proton crossing time, individual heated loops approach an isothermal state. In the collisionless limit, conservation of the magnetic moment restricts the accessible velocity space, producing a strong temperature anisotropy, with parallel temperature exceeding perpendicular temperature, and additional density depletion. We find that Coulomb pitch-angle scattering efficiently suppresses these effects under typical coronal conditions. In the short-time-scale regime, density and temperature profiles approach those obtained with a constant magnetic field, while gravitational and collisional filtering sustain the temperature inversion. In the strongly collisional long-time-scale regime, magnetic-field-induced anisotropy is nearly eliminated, and individual loops remain approximately isotropic and isothermal. An increasing temperature profile then emerges only after averaging over unresolved flux tubes with different temperatures. Thus, Coulomb collisions largely suppress the macroscopic kinetic signatures of magnetic-field inhomogeneity in the transition region and low corona.
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BibTeX
@misc{barbieri2026gravitational,
title = {{Gravitational filtering, magnetic-field inhomogeneity and Coulomb collisions in a kinetic model of a plasma atmosphere with stochastic heating at its base}},
author = {Luca Barbieri and Pascal Démoulin and Daniel Verscharen},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.24678},
eprint = {2610.24678},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.24678},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Gravitational filtering, magnetic-field inhomogeneity and Coulomb collisions in a kinetic model of a plasma atmosphere with stochastic heating at its base
AU - Luca Barbieri
AU - Pascal Démoulin
AU - Daniel Verscharen
PY - 2026
DA - 2026/10/17
PB - arXiv
DO - 10.48550/arxiv.2610.24678
UR - https://arxiv.org/abs/2610.24678
AB - We investigate the effects of stochastic heating, magnetic inhomogeneity, and Coulomb collisions in coronal loops using a reduced kinetic model. Coulomb collisions thermalize suprathermal populations generated by intermittent heating and populate velocity-space regions inaccessible from the lower boundary in the collisionless limit. We consider two regimes: when heating varies faster than the electron crossing time, the plasma develops a multitemperature nonthermal distribution; when it varies more slowly than the proton crossing time, individual heated loops approach an isothermal state. In the collisionless limit, conservation of the magnetic moment restricts the accessible velocity space, producing a strong temperature anisotropy, with parallel temperature exceeding perpendicular temperature, and additional density depletion. We find that Coulomb pitch-angle scattering efficiently suppresses these effects under typical coronal conditions. In the short-time-scale regime, density and temperature profiles approach those obtained with a constant magnetic field, while gravitational and collisional filtering sustain the temperature inversion. In the strongly collisional long-time-scale regime, magnetic-field-induced anisotropy is nearly eliminated, and individual loops remain approximately isotropic and isothermal. An increasing temperature profile then emerges only after averaging over unresolved flux tubes with different temperatures. Thus, Coulomb collisions largely suppress the macroscopic kinetic signatures of magnetic-field inhomogeneity in the transition region and low corona.
ER -