منابع مشابه
Weak collisionless shocks in laser-plasmas
We obtain a theory describing laminar shock-like structures in a collisionless plasma and examine the parameter limits, in terms of the ion sound Mach number and the electron/ion temperature ratio, within which these structures exist. The essential feature is the inclusion of nite ion temperature with the result that some ions are reected from a potential ramp. This destroys the symmetry betw...
متن کاملOn Electron Adiabaticity in Collisionless Shocks
Collisionless shocks are considered as one of the most efficient phenomena for the electron acceleration in space and astrophysical plasmas, yet the detailed acceleration process and heating mechanism remain unsolved. Various acceleration and heating mechanisms have so far been proposed and discussed to explain the spacecraft measurements in situ at Earth’s bow shock, involving the large-scale ...
متن کاملCollisionless plasma shocks in striated electron temperatures.
The existence of low frequency waveguide modes of ion acoustic waves is demonstrated in magnetized plasmas for electron temperatures striated along the magnetic field lines. At higher frequencies, in a band between the ion cyclotron and the ion plasma frequency, radiative modes develop and propagate obliquely to the field away from the striation. Arguments for the subsequent formation and propa...
متن کاملElectron temperature gradient scale at collisionless shocks.
Shock waves are ubiquitous in space and astrophysics. They transform directed flow energy into thermal energy and accelerate energetic particles. The energy repartition is a multiscale process related to the spatial and temporal structure of the electromagnetic fields within the shock layer. While large scale features of ion heating are known, the electron heating and smaller scale fields remai...
متن کاملWaves and Instabilities in Collisionless Shocks
By scattering particles and causing dissipation, waves in a collisionless shock play a role similar to collisions in an ordinary gas. In describing the waves and instability that occur near a shock three regions must be considered: (1) the transition region, (2) the upstream region, and (3) the downstream region. The transition region is usually characterized by an abrupt broadband burst of ele...
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ژورنال
عنوان ژورنال: Space Science Reviews
سال: 2018
ISSN: 0038-6308,1572-9672
DOI: 10.1007/s11214-018-0516-3