Nonlinear evolution of Buneman instability and its implication for electron acceleration in high Mach number collisionless perpendicular shocks
Nonlinear evolution of the Buneman instability and its application to electron acceleration in collisionless shocks are discussed. Two-dimensional particle-in-cell simulations show that the saturation...
Nonlinear evolution of the Buneman instability and its application to electron acceleration in collisionless shocks are discussed. Two-dimensional particle-in-cell simulations show that the saturation...
Quasi-thermal noise in space plasma: “kappa” distributions
The transport of energy in collisionless plasmas, especially in space plasmas, is far from being understood. Measuring the temperature of the electrons and their nonthermal properties can give importa...
The transport of energy in collisionless plasmas, especially in space plasmas, is far from being understood. Measuring the temperature of the electrons and their nonthermal properties can give importa...
Kinetic theory for the ion humps at the foot of the Earth's bow shock
Phys. Plasmas 16, 102902 (2009); doi:10.1063/1.3240342
Published 5 October 2009
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The nonlinear kinetic theory is presented for the ion acoustic perturbations at the foot of the Earth's quasiperpendicular bow shock, that is characterized by weakly magnetized electrons and unmagnetized ions. The streaming ions, due to the reflection of the solar wind ions from the shock, provide the free energy source for the linear instability of the acoustic wave. In the fully nonlinear regime, a coherent localized solution is found in the form of a stationary ion hump, which is traveling with the velocity close to the phase velocity of the linear mode. The structure is supported by the nonlinearities coming from the increased population of the resonant beam ions, trapped in the self-consistent potential. As their size in the direction perpendicular to the local magnetic field is somewhat smaller that the electron Larmor radius and much larger that the Debye length, their spatial properties are determined by the effects of the magnetic field on weakly magnetized electrons. These coherent structures provide a theoretical explanation for the bipolar electric pulses, observed upstream of the shock by Polar and Cluster satellite missions.
©2009 American Institute of Physics
| History: | Received 3 August 2009; accepted 4 September 2009; published 5 October 2009 |
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http://link.aip.org/link/?PHPAEN/16/102902/1 |
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KEYWORDS and PACS
ion beams,
plasma instability,
plasma ion acoustic waves,
plasma kinetic theory,
plasma nonlinear waves,
plasma shock waves,
plasma-beam interactions,
solar wind
- 52.25.Dg
Plasma kinetic equations - 52.35.Tc
Shock waves and discontinuities in plasma - 52.35.Fp
Plasma electrostatic waves and oscillations - 52.35.Mw
Nonlinear phenomena: plasma waves, wave propagation and other interactions - 96.50.Ci
Solar wind plasma; sources of solar wind - 96.50.Fm
Planetary bow shocks; interplanetary shocks - YEAR: 2009
RELATED DATABASES
PUBLICATION DATA
1070-664X (print)
1089-7674 (online)
AIP
REFERENCES (14)
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