Hydromagnetic Radiation Due to the Mirroring Diamagnetic Particles

抄録

Hydromagnetic radiations generated by the motion of energetic charged particles in a uniform cold plasma are investigated. A hydromagnetic Cherenkov radiation emitted by diamagnetic particles moving coherently along the uniform field lines is first discussed and its differential energy spectrum is obtained. Next, hydromagnetic disturbances of the isotropic mode due to the mirroring motion of diamagnetic particles are quantitatively studied. Frequency and intensity variations with time for the emitted signals are given in several numerical illustrations. It is shown that the frequency of arrived signals with an appreciable intensity decreases with increasing of time. This falling tone character is ascribed to the Doppler effect of the moving source with the decreasing velocity, when it is approaching toward the observing point.