FEATURES OF THE MAGNETIC-FIELD OF THE EQUATORIAL ELECTROJET DETERMINED FROM EXPERIMENTAL-DATA FOR THE SOUTH-EASTERN ASIA REGION

Experimental data, obtained in Vietnam, have been used for studying th e solar-diurnal variations of the magnetic field in the equatorial ele ctrojet region and for comparing them with the worldwide part of S-q-v ariations. The features of equatorial electrojet variations were inves tigated at different stages, from their appearance in the morning, to their decline in the evening and their disappearance at night. The cha racter of dip equatorial variations on days of a reverse jet electric current is considered. It is shown that eastward electrojet currents i n the daytime ionosphere gradually decay far into the night. The quest ion of a shift of the electrojet axis during the day is examined. (C) 1997 Elsevier Science Ltd.