Synchronous disturbances of ionospheric (layers F2, E, and Es) electron density and the geomagnetic field components during the intervals of strong earthquakes (exceeding 6.5 on the Richter magnitude scale) (8 January 2006 and 17 July 2006 off the west coast of Indonesia) have been detected. These disturbances are supposed to be related to the formation of magnetogravity waves (MGWs) during the development of high energy geophysical events. The enhancement of MGW activity takes place two days before and after the quake. On the day of the event MGWs are not registered except for the passage of acoustic-gravity waves. The existence of MGWs is analytically confirmed by the dispersion analysis under conditions of the horizontal geomagnetic field (near-equatorial regions) and the finite ionospheric conductivity.
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