نتایج جستجو برای: lower hybrid waves
تعداد نتایج: 980594 فیلتر نتایج به سال:
In Alcator C-Mod discharges lower hybrid waves have been shown to induce a countercurrent change in toroidal rotation of up to 60 km/s in the central region of the plasma (r/a approximately <0.4). This modification of the toroidal rotation profile develops on a time scale comparable to the current redistribution time (approximately 100 ms) but longer than the energy and momentum confinement tim...
Experimental data are presented that are consistent with the hypothesis that anomalous rf absorption in helicon sources is due to electron scattering arising from parametrically driven ion-acoustic waves downstream from the antenna. Also presented are ion temperature measurements demonstrating anisotropic heating (T( perpendicular)>T(parallel)) at the edge of the discharge. The most likely expl...
Solitary waves in the Earth's magnetosphere: Nonlinear stage of the lower-hybrid Buneman instability
By means of one-dimensional, electromagnetic, particle-in-cell simulations considering the effects energetic-ion injection, we study harmonic structure lower hybrid waves (LHWs) driven by energetic ions under condition where electron plasma frequency (${\ensuremath{\omega}}_{pe}$) is smaller than cyclotron (${\mathrm{\ensuremath{\Omega}}}_{e}$). It found that after LHWs are excited with wave nu...
We consider in more detail a model previously proposed for the hard X-ray (> 10 keV) emission observed from the supernova remnant Cas A, whereby electrons are accelerated by lower-hybrid waves and radiate bremsstrahlung. We consider both cold and thermal plasma limits of the modified two-stream instability that generates the lower-hybrid waves, and by studying time dependent ionization balance ...
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