A Critical Mach Number for Electron Injection in Collisionless Shocks
نویسندگان
چکیده
منابع مشابه
A critical Mach number for electron injection in collisionless shocks.
Electron acceleration in collisionless shocks with arbitrary magnetic field orientations is discussed. It is shown that the injection of thermal electrons into the diffusive shock acceleration process is achieved by an electron beam with a loss cone in velocity space that is reflected back upstream from the shock through the shock drift acceleration mechanism. The electron beam is able to excit...
متن کاملA Physical Relationship between Electron-proton Temperature Equilibration and Mach Number in Fast Collisionless Shocks
The analysis of Balmer-dominated optical spectra from non-radiative (adiabatic) SNRs has shown that the ratio of the electron to proton temperature at the blast wave is close to unity at vS .400 km s , but declines sharply down to the minimum value of me/mp dictated by the jump conditions at shock speeds exceeding 2000 km s . We propose a physical model for the heating of electrons and ions in ...
متن کاملVery high Mach-number electrostatic shocks in collisionless plasmas.
The kinetic theory of collisionless electrostatic shocks resulting from the collision of plasma slabs with different temperatures and densities is presented. The theoretical results are confirmed by self-consistent particle-in-cell simulations, revealing the formation and stable propagation of electrostatic shocks with very high Mach numbers (M>>10), well above the predictions of the classical ...
متن کاملElectron Acceleration at a Low-mach-number Perpendicular Collisionless Shock
A full particle simulation study is carried out on the electron acceleration at a collisionless, relatively low Alfven Mach number (MA = 5), perpendicular shock. Recent self-consistent hybrid shock simulations have demonstrated that the shock front of perpendicular shocks has a dynamic rippled character along the shock surface of low-Mach-number perpendicular shocks. In this paper, the effect o...
متن کامل6 Electron Injection at High Mach Number Quasi - Perpendicular Shocks : Surfing and Drift Acceleration
Electron injection process at high Mach number collisionless quasi-perpendicular shock waves is investigated by means of one-dimensional electromagnetic particle-in-cell simulations. We find that energetic electrons are generated through the following two steps : (1) electrons are accelerated nearly perpendicular to the local magnetic field by shock surfing acceleration at the leading edge of t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2010
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.104.181102