Ciência-IUL
Publicações
Descrição Detalhada da Publicação
Título Revista
Physical Review E
Ano (publicação definitiva)
2015
Língua
Inglês
País
Estados Unidos da América
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Abstract/Resumo
Electron-scale surface waves are shown to be unstable in the transverse plane of a sheared flow in an initially unmagnetized collisionless plasma, not captured by (magneto) hydrodynamics. It is found that these unstable modes have a higher growth rate than the closely related electron-scale Kelvin-Helmholtz instability in relativistic shears. Multidimensional particle-in-cell simulations verify the analytic results and further reveal the emergence of mushroomlike electron density structures in the nonlinear phase of the instability, similar to those observed in the Rayleigh Taylor instability despite the great disparity in scales and different underlying physics. This transverse electron-scale instability may play an important role in relativistic and supersonic sheared flow scenarios, which are stable at the (magneto) hydrodynamic level. Macroscopic (>> c/omega(pe)) fields are shown to be generated by this microscopic shear instability, which are relevant for particle acceleration, radiation emission, and to seed magnetohydrodynamic processes at long time scales.
Agradecimentos/Acknowledgements
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Palavras-chave
Classificação Fields of Science and Technology
- Matemáticas - Ciências Naturais
- Ciências Físicas - Ciências Naturais
Registos de financiamentos
Referência de financiamento | Entidade Financiadora |
---|---|
267841 | Comissão Europeia |
IF/01780/2013 | Fundação para a Ciência e a Tecnologia |
SFRH/BD/75558/2010 | Fundação para a Ciência e a Tecnologia |