翻訳と辞書 Words near each other ・ Waves (Katrina and the Waves album) ・ Waves (Mono Band song) ・ Waves (Moving Mountains album) ・ Waves (Mr Probz song) ・ Waves (Rhydian Roberts album) ・ Waves (Sam Rivers album) ・ Waves (Terje Rypdal album) ・ Waves (Waves album) ・ Waves and shallow water ・ Waves and the Both of Us ・ Waves Are Dancing ・ Waves Are Universal ・ Waves Audio ・ Waves FM ・ Waves II ・ Waves in plasmas ・ Waves of Dreams ・ Waves of Economic Development ・ Waves of feminism ・ Waves of mass migrations from Hong Kong ・ Waves of Sound ・ Waves of the Danube ・ Waves of Visual Decay ・ Waves under Water ・ Waves Vienna ・ Waves, North Carolina ・ Waves4Power ・ Waveshaper ・ Waveshaper (musician) ・ Waveski Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Waves in plasmas ： ウィキペディア英語版 Waves in plasmas In plasma physics, waves in plasmas are an interconnected set of particles and fields which propagates in a periodically repeating fashion. A plasma is a quasineutral, electrically conductive fluid. In the simplest case, it is composed of electrons and a single species of positive ions, but it may also contain multiple ion species including negative ions as well as neutral particles. Due to its electrical conductivity, a plasma couples to electric and magnetic fields. This complex of particles and fields supports a wide variety of wave phenomena. == Terminology and classification == Waves in plasmas can be classified as electromagnetic or electrostatic according to whether or not there is an oscillating magnetic field. Applying Faraday's law of induction to plane waves, we find $\backslash mathbf\backslash times\backslash tilde\}$, implying that an electrostatic wave must be purely longitudinal. An electromagnetic wave, in contrast, must have a transverse component, but may also be partially longitudinal. Waves can be further classified by the oscillating species. In most plasmas of interest, the electron temperature is comparable to or larger than the ion temperature. This fact, coupled with the much smaller mass of the electron, implies that the electrons move much faster than the ions. An electron mode depends on the mass of the electrons, but the ions may be assumed to be infinitely massive, i.e. stationary. An ion mode depends on the ion mass, but the electrons are assumed to be massless and to redistribute themselves instantaneously according to the Boltzmann relation. Only rarely, e.g. in the lower hybrid oscillation, will a mode depend on both the electron and the ion mass. The various modes can also be classified according to whether they propagate in an unmagnetized plasma or parallel, perpendicular, or oblique to the stationary magnetic field. Finally, for perpendicular electromagnetic electron waves, the perturbed electric field can be parallel or perpendicular to the stationary magnetic field. ^2 || plasma oscillation (or Langmuir wave) |- | $\backslash vec\; k\backslash perp\backslash vec\; B\_0$ || $\backslash omega^2=\backslash omega\_p^2+\backslash omega\_c^2=\backslash omega\_h^2$ || upper hybrid oscillation |- | rowspan = 3 | ions || $\backslash vec\; B\_0=0\backslash \; \backslash \; \backslash vec\; k\backslash |\backslash vec\; B\_0$ || $\backslash omega^2=k^2v\_s^2=k^2\backslash frac$ || ion acoustic wave |- | $\backslash vec\; k\backslash perp\backslash vec\; B\_0$ (nearly)|| $\backslash omega^2=\backslash Omega\_c^2+k^2v\_s^2$ || electrostatic ion cyclotron wave |- | $\backslash vec\; k\backslash perp\backslash vec\; B\_0$ (exactly)|| $\backslash omega^2=()^$ || lower hybrid oscillation |- | rowspan = 8 | electromagnetic || rowspan = 5 | electrons || $\backslash vec\; B\_0=0$ || $\backslash omega^2=\backslash omega\_p^2+k^2c^2$ || light wave |- | $\backslash vec\; k\backslash perp\backslash vec\; B\_0,\backslash \; \backslash vec\; E\_1\backslash |\backslash vec\; B\_0$ || $\backslash frac=1-\backslash frac$ || O wave |- | $\backslash vec\; k\backslash perp\backslash vec\; B\_0,\backslash \; \backslash vec\; E\_1\backslash perp\backslash vec\; B\_0$ || $\backslash frac=1-\backslash frac\backslash ,$ \frac || X wave |- | $\backslash vec\; k\backslash |\backslash vec\; B\_0$ (right circ. pol.)|| $\backslash frac=1-\backslash frac$ || R wave (whistler mode) |- | $\backslash vec\; k\backslash |\backslash vec\; B\_0$ (left circ. pol.)|| $\backslash frac=1-\backslash frac$ || L wave |- | rowspan = 3 | ions || $\backslash vec\; B\_0=0$ ||   || none |- | $\backslash vec\; k\backslash |\backslash vec\; B\_0$ || $\backslash omega^2=k^2v\_A^2$ || Alfvén wave |- | $\backslash vec\; k\backslash perp\backslash vec\; B\_0$ || $\backslash frac=c^2\backslash ,$ \frac || magnetosonic wave |} $\backslash omega$ - wave frequency, $k$ - wave number, $c$ - speed of light, $\backslash omega\_p$ - plasma frequency, $\backslash omega\_i$ - ion plasma frequency, $\backslash omega\_c$ - electron gyrofrequency, $\backslash Omega\_c$ - proton gyrofrequency, $\backslash omega\_h$ - upper hybrid frequency, $v\_s$ - plasma "sound" speed, $v\_A$ - plasma Alfvén speed 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Waves in plasmas」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.