The dynamics of electron holes in current sheets
arXiv:2011.04198 · doi:10.1063/5.0029999
Abstract
We present 1.5D Vlasov code simulations of the dynamics of electron holes in non-uniform magnetic and electric fields typical of current sheets and, particularly, of the Earth's magnetotail current sheet. The simulations show that spatial width and amplitude of electron holes do not substantially vary in the course of propagation, but there arises a double layer localized around the electron hole and manifested as a drop of the electrostatic potential along the electron hole. We demonstrate that electron holes produced around the neutral plane of a current sheet slow down in the course of propagation toward the current sheet boundaries. The leading contribution to electron hole braking is provided by the non-uniform magnetic field, though electrostatic fields typical of the current sheets do provide a noticeable contribution. The simulations also show that electron holes with larger amplitudes are slowed faster. The simulation results suggest that some of slow electron holes recently reported in the Earth's plasma sheet boundary layer may appear due to braking of initially fast electron holes in the course of propagation in the current sheet.
References in corpus (11)
- Nonthermal Electrons at High Mach Number Shocks: Electron Shock Surfing Acceleration
- Electron Holes and Heating in the Reconnection Dissipation Region
- Bipolar Electric Field Signatures of Reconnection Separatrices for a Hydrogen Plasma at Realistic Guide Fields
- Electron Heating by Debye-Scale Turbulence in Guide-Field Reconnection
- Nonlinear Development of Streaming Instabilities In Strongly Magnetized Plasmas
- Laboratory measurements of electrostatic solitary structures generated by electron beam injection
- Electrostatic turbulence and Debye-scale structures in collisionless shocks
- On the Role of Separatrix Instabilities in Heating the Reconnection Outflow Region
- How Anomalous Resistivity Accelerates Magnetic Reconnection
- Electron acceleration and thermalization at magnetotail separatrices
- Slow electrostatic fluctuations generated by beam-plasma interaction