A CONSIDERATION ON TIDAL WAVE TRANSMISSION THROUGH IONIZED ATMOSPHERE

We investigate the effect of (J×B0) force on the tidal wave transmission where J is electric current and B0 the geomagnetic field. It is found that the force is considerably effective on any positive mode of the diurnal tide and the semi-diurnal tide except for the first semi-diurnal mode. The diurnal and semi-diurnal velocity oscillations of these modes, which are excited in the lower neutral atmosphere, cannot be transferred to the ionized atmosphere. An exception occurs, however, at the magnetic equator, where (J×B0) force is almost ineffective. The refractive index of the tidal wave is calculated for a simple model where the Coriolis force is ignored and (J×B0) is assumed to be uniform with longitude and latitude. © 1969, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.