Electron Heating in 2D Particle-in-cell Simulations of Quasi-perpendicular Low-beta Shocks
Abstract
Abstract We measure the thermal electron energization in 1D and 2D particle-in-cell simulations of quasi-perpendicular, low-beta ( β p = 0.25) collisionless ion–electron shocks with mass ratio m i / m e = 200, fast Mach number –4, and upstream magnetic field angle θ Bn = 55°–85° from the shock normal . It is known that shock electron heating is described by an ambipolar, B -parallel electric potential jump, Δ ϕ ∥ , that scales roughly linearly with the electron temperature jump. Our simulations have –0.2 in units of the pre-shock ions’ bulk kinetic energy, in agreement with prior measurements and simulations. Different ways to measure ϕ ∥ , including the use of de Hoffmann–Teller frame fields, agree to tens-of-percent accuracy. Neglecting off-diagonal electron pressure tensor terms can lead to a systematic underestimate of ϕ ∥ in our low- β p shocks. We further focus on two θ Bn = 65° shocks: a ( ) case with a long, 30 d i precursor of whistler waves along , and a ( ) case with a shorter, 5 d i precursor of whistlers oblique to both and B ; d i is the ion skin depth. Within the precursors, ϕ ∥ has a secular rise toward the shock along multiple whistler wavelengths and also has localized spikes within magnetic troughs. In a 1D simulation of the , θ Bn = 65° case, ϕ ∥ shows a weak dependence on the electron plasma-to-cyclotron frequency ratio ω pe /Ω ce , and ϕ ∥ decreases by a factor of 2 as m i / m e is raised to the true proton–electron value of 1836.
- Authors:
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 2332919
- Grant/Contract Number:
- SC0023015
- Resource Type:
- Published Article
- Journal Name:
- The Astrophysical Journal
- Additional Journal Information:
- Journal Name: The Astrophysical Journal Journal Volume: 965 Journal Issue: 1; Journal ID: ISSN 0004-637X
- Publisher:
- American Astronomical Society
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Tran, Aaron, and Sironi, Lorenzo. Electron Heating in 2D Particle-in-cell Simulations of Quasi-perpendicular Low-beta Shocks. United States: N. p., 2024.
Web. doi:10.3847/1538-4357/ad1f69.
Tran, Aaron, & Sironi, Lorenzo. Electron Heating in 2D Particle-in-cell Simulations of Quasi-perpendicular Low-beta Shocks. United States. https://doi.org/10.3847/1538-4357/ad1f69
Tran, Aaron, and Sironi, Lorenzo. Tue .
"Electron Heating in 2D Particle-in-cell Simulations of Quasi-perpendicular Low-beta Shocks". United States. https://doi.org/10.3847/1538-4357/ad1f69.
@article{osti_2332919,
title = {Electron Heating in 2D Particle-in-cell Simulations of Quasi-perpendicular Low-beta Shocks},
author = {Tran, Aaron and Sironi, Lorenzo},
abstractNote = {Abstract We measure the thermal electron energization in 1D and 2D particle-in-cell simulations of quasi-perpendicular, low-beta ( β p = 0.25) collisionless ion–electron shocks with mass ratio m i / m e = 200, fast Mach number M ms = 1 –4, and upstream magnetic field angle θ Bn = 55°–85° from the shock normal n ˆ . It is known that shock electron heating is described by an ambipolar, B -parallel electric potential jump, Δ ϕ ∥ , that scales roughly linearly with the electron temperature jump. Our simulations have Δ ϕ ∥ / ( 0.5 m i u sh 2 ) ∼ 0.1 –0.2 in units of the pre-shock ions’ bulk kinetic energy, in agreement with prior measurements and simulations. Different ways to measure ϕ ∥ , including the use of de Hoffmann–Teller frame fields, agree to tens-of-percent accuracy. Neglecting off-diagonal electron pressure tensor terms can lead to a systematic underestimate of ϕ ∥ in our low- β p shocks. We further focus on two θ Bn = 65° shocks: a M s = 4 ( M A = 1.8 ) case with a long, 30 d i precursor of whistler waves along n ˆ , and a M s = 7 ( M A = 3.2 ) case with a shorter, 5 d i precursor of whistlers oblique to both n ˆ and B ; d i is the ion skin depth. Within the precursors, ϕ ∥ has a secular rise toward the shock along multiple whistler wavelengths and also has localized spikes within magnetic troughs. In a 1D simulation of the M s = 4 , θ Bn = 65° case, ϕ ∥ shows a weak dependence on the electron plasma-to-cyclotron frequency ratio ω pe /Ω ce , and ϕ ∥ decreases by a factor of 2 as m i / m e is raised to the true proton–electron value of 1836.},
doi = {10.3847/1538-4357/ad1f69},
journal = {The Astrophysical Journal},
number = 1,
volume = 965,
place = {United States},
year = {Tue Apr 02 00:00:00 EDT 2024},
month = {Tue Apr 02 00:00:00 EDT 2024}
}
https://doi.org/10.3847/1538-4357/ad1f69
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