Guio, P;
Pécseli, HL;
(2020)
Weakly nonlinear ion sound waves in gravitational systems.
Physical Review E
, 101
(4)
, Article 043210. 10.1103/PhysRevE.101.043210.
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Abstract
Ion sound waves are studied in a plasma subject to gravitational field giving rise to vertically inhomogeneous steady-state plasma conditions. Such systems are interesting by exhibiting a wave growth that is a result of energy flux conservation for pulses propagating in an inhomogeneous system. The increase of the amplitude of a pulse as it propagates along the density gradient in the direction of decreasing density gives rise to an enhanced interaction between waves and plasma particles that can be modeled by a modified Korteweg–de Vries equation. Analytical results are compared with numerical particle-in-cell simulations of the problem. Our code assumes isothermally Boltzmann distributed electrons resulting in a nonlinear Poisson equation. The ion component is treated as a collection of individual particles interacting through collective electric fields. Deviations from quasineutrality are allowed for.
| Type: | Article |
|---|---|
| Title: | Weakly nonlinear ion sound waves in gravitational systems |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevE.101.043210 |
| Publisher version: | https://doi.org/10.1103/PhysRevE.101.043210 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10096984 |
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