Magneto Gas Dynamic Analogue of Cerenkov Radiation - II

A uniformly moving charged particle, traversing a plasma in the direction of the lines of force of an ambient geomagnetic field, produces low intensity radiation at frequencies below the ion gyro frequency by the Cerenkov mechanism. Because of the anisotropy of the medium, the phase relation for radiation can be satisfied by particles moving slower than the Alfven velocity as well as by particles moving faster. The former (anonolous) effect will be much smaller than the latter in ultra-low frequency ionospheric applications, but can perhaps be made comparable in laboratory experiments.