01 Dec 2022
01 Dec 2022
Status: this preprint is open for discussion.

Fluid Models Capturing Farley-Buneman Instabilities

Enrique Rojas1, Keaton Burns2, and David Hysell1 Enrique Rojas et al.
  • 1Earth and Atmospheric Sciences, Cornell University
  • 2Mathematics, Massachusetts Institute of Technology

Abstract. It is generally accepted that modeling Farley-Buneman instabilities require resolving ion Landau damping to reproduce experimentally observed features. Particle-in-cell (PIC) simulations have been able to reproduce most of these, but at a computational cost that severely affects their scalability. This limitation hinders the study of non-local phenomena that require three dimensions or coupling with larger--scale processes. We argue that a form of the five-moment fluid system can recreate several qualitative aspects of Farley-Buneman dynamics such as density and phase speed saturation, wave turning, and heating. Unexpectedly, these features are still reproduced even without using artificial viscosity to capture Landau damping. Comparing the proposed fluid models and a PIC implementation shows good qualitative agreement.

Enrique Rojas et al.

Status: open (until 18 Feb 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1264', Anonymous Referee #1, 05 Jan 2023 reply
    • AC1: 'Reply on RC1', Enrique Rojas Villalba, 20 Jan 2023 reply
      • RC2: 'Reply on AC1', Anonymous Referee #1, 24 Jan 2023 reply

Enrique Rojas et al.

Enrique Rojas et al.


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Short summary
The standard linear fluid theory of Farley-Buneman predicts that kinetic physics is required to avoid the artificial growth of smaller structures. We decided to explore the possibility of simulating Farley-Buneman using, for the first time, a fully fluid five-moment model. This is the first time a fully fluid model has been used to simulate the Farley-Buneman instability. The results obtained with both models are qualitatively consistent with the ones from kinetic simulations.