NETWORK OBSERVATION OF IONOSPHERIC DISTURBANCES DURING THE WAGS IN OCTOBER,1985

<正> A three-station network of HF Doppler measurements augmented with a single rapid-run ionosonde is used at Wuhan Ionospheric Observatory, China, to monitor the atmosphericgravity wave disturbances during the WAGS campaign. The records observed in the daytimeon October 18, 1985 (in Incoherent Scatter World Day Run) are investigated. It is found thatthere exist two wave trains of disturbances in the daytime: one is a medium-scale internalgravity wave excited locally and the other is a large-scale guided gravity wave propagatingfrom north to south. Both the horizontal propagation and the height variation of the gravitywave disturbances are studied in detail with a new inversion method. The results indicatethat the inversion method makes the simple HF radio experiment system very useful in thestudy of large scale ionospheric disturbances such as gravity waves.