Abstract
The energy partition in high Mach number collisionless shock waves is central to a wide range of high-energy astrophysical environments. We present a new theoretical model for electron heating that accounts for the energy exchange between electrons and ions at the shock. The fundamental mechanism relies on the difference in inertia between electrons and ions, resulting in differential scattering of the particles off a decelerating magnetically dominated microturbulence across the shock transition. We show that the self-consistent interplay between the resulting ambipolar-type electric field and diffusive transport of electrons leads to efficient heating in the magnetic field produced by the Weibel instability in the high Mach number regime and is consistent with fully kinetic simulations.
Original language | English (US) |
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Article number | 265201 |
Journal | Physical review letters |
Volume | 132 |
Issue number | 26 |
DOIs | |
State | Published - Jun 28 2024 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy