STUDIES HAVE SUGGESTED THAT THE TIDES AND WAVES ASSOCIATED WITH TERRESTRIAL WEATHER CAN SIGNIFICANTLY CONTRIBUTE TO THE DAY-TO-DAY VARIABILITY OF THE EQUATORIAL ELECTRIC FIELD UNDER LOW SOLAR ACTIVITY AND QUIET GEOMAGNETIC CONDITIONS. WHEN GEOMAGNETIC ACTIVITY INCREASES THE ELECTRODYNAMICS IS FURTHER INFLUENCED BY THE DISTURBANCE WIND DYNAMO AND A PENETRATION ELECTRIC FIELD ORIGINATING IN THE MAGNETOSPHERE. THE TEMPORAL AND SPATIAL VARIATIONS OF STORM-TIME EQUATORIAL ELECTRODYNAMICS STRONGLY DEPEND ON THE EVOLUTION OF GEOMAGNETIC DISTURBANCE THE NATURE OF THE ENERGY INPUTS TO THE IONOSPHERE AND THERMOSPHERE AND THE RESPONSE OF THE THERMOSPHERIC DYNAMICS. THE CORRESPONDING CHANGES IN THE IONOSPHERE-THERMOSPHERE (I-T) SYSTEM BECOME MUCH MORE COMPLEX AND WITH THE TEMPORAL AND SPATIAL VARIATIONS OF EQUATORIAL ELECTRIC FIELDS REFLECTING DIFFERENT PHYSICAL PROCESSES OCCURRING DURING GEOMAGNETIC STORMS.

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