Upper hybrid oscillation
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 ω 2 = ω p e 2 + ω c e 2 + 3 k 2 v e , t h 2 {\displaystyle \omega ^{2}=\omega _{pe}^{2}+\omega _{ce}^{2}+3k^{2}v_{\mathrm {e,th} }^{2}} , where (in cgs units) ω p e = ( 4 π n e e 2 / m e ) 1 / 2 {\displaystyle \omega _{pe}=(4\pi n_{e}e^{2}/m_{e})^{1/2}} is the electron plasma frequency, and ω c e = e B / m e c {\displaystyle \omega _{ce}=eB/{m_{e}c}} is the electron cyclotron frequency.