Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Upper_hybrid_oscillation> ?p ?o. }
Showing items 1 to 21 of
21
with 100 items per page.
- Upper_hybrid_oscillation abstract "In plasma physics, an upper hybrid oscillation is a mode of oscillation of a magnetized plasma. It consists of a longitudinal motion of the electrons perpendicular to the magnetic field with the dispersion relation,where (in cgs units)is the electron plasma frequency, andis the electron cyclotron frequency.This oscillation is closely related to the plasma oscillation found in unmagnetized plasmas or parallel to the magnetic field, where the ωpe term arises from the electrostatic Coulomb restoring force and the 3k²ve,th² term arises from the restoring force of electron pressure. In the upper hybrid oscillation there is an additional restoring force due to the Lorentz force. Consider a plane wave where all perturbed quantities vary as exp(i(kx-ωt)). If the displacement in the direction of propagation is δx, thenvx = -iωδfy = nevxBz/c = -iω(neBz/c)δvy = -fy/iωnm = (eBz/mc)δfx = -nevyBz/c = -(nm)(eBz/mc)²δax = -ωce²δThus the perpendicular magnetic field effectively provides a harmonic restoring force with a frequency ωce, explaining the third term in the dispersion relation. The particle orbits (or fluid trajectories) are ellipses in the plane perpendicular to the magnetic field, elongated in the direction of propagation.The frequency of long wavelength oscillations is a "hybrid", or mix, of the electron plasma and electron cyclotron frequencies,ωh² = ωpe² + ωce²,and is known as the upper hybrid frequency. There are also a lower hybrid frequency and lower hybrid oscillations.For propagation at angles oblique to the magnetic field, two modes exist simultaneously. If the plasma frequency is higher than the cyclotron frequency, then the upper hybrid oscillation transforms continuously into the plasma oscillation. The frequency of the other mode varies between the cyclotron frequency and zero. Otherwise, the frequency of the mode related to the upper hybrid oscillation remains above the cyclotron frequency, and the mode related to the plasma oscillation remains below the plasma frequency. In particular, the frequencies are given by".
- Upper_hybrid_oscillation wikiPageID "1899995".
- Upper_hybrid_oscillation wikiPageRevisionID "574258032".
- Upper_hybrid_oscillation hasPhotoCollection Upper_hybrid_oscillation.
- Upper_hybrid_oscillation subject Category:Waves_in_plasmas.
- Upper_hybrid_oscillation type Abstraction100002137.
- Upper_hybrid_oscillation type Event100029378.
- Upper_hybrid_oscillation type Happening107283608.
- Upper_hybrid_oscillation type Movement107309781.
- Upper_hybrid_oscillation type PsychologicalFeature100023100.
- Upper_hybrid_oscillation type Wave107352190.
- Upper_hybrid_oscillation type WavesInPlasmas.
- Upper_hybrid_oscillation type YagoPermanentlyLocatedEntity.
- Upper_hybrid_oscillation comment "In plasma physics, an upper hybrid oscillation is a mode of oscillation of a magnetized plasma.".
- Upper_hybrid_oscillation label "Upper hybrid oscillation".
- Upper_hybrid_oscillation sameAs m.064t56.
- Upper_hybrid_oscillation sameAs Q7899042.
- Upper_hybrid_oscillation sameAs Q7899042.
- Upper_hybrid_oscillation sameAs Upper_hybrid_oscillation.
- Upper_hybrid_oscillation wasDerivedFrom Upper_hybrid_oscillation?oldid=574258032.
- Upper_hybrid_oscillation isPrimaryTopicOf Upper_hybrid_oscillation.