The high energy particle acceleration mechanisms are discussed by focusing on the direct acceleration in the astrophysical context. We specifically argue that the relativistic magnetic reconnection and the shock surfing/surfatron processes can efficiently accelerate charged particles to a relativistic energy, and that those mechanisms may produce a non‐thermal, power‐law energy spectrum.
- Energy efficiency
- Particle acceleration
- Charged particle acceleration
- Charged particle spectroscopy
- Magnetic reconnection
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