THE AVERAGE AND STORM-TIME BEHAVIORS OF IONOSPHERE OVER MANZHOULI

This paper presents the reduction results of ionosonde data and NNSS measured data at Manzhouli (38.07 mag. lat.) during 1983. The average behaviors and some anomalies of storm-time variations of the ionosphere above Manzhouli are obtained by analysing the critical frequency f₀F₂ and TEC N_T deduced from differential Doppler data.The results indicate that the behaviors of ionosphere in average show a typical seasonal anomaly and good agreement between the variations of f₀F₂ and N_T.Most of the ionospheric disturbances over Manzhouli is occurred in Equinox and Winter. The positive disturbances mostly happened in Winter, mixing positive and negative ones in Equinox, and negative ones in Summer and Equinox.It is shown that the good linear correlation is existed between the RMS value δAp of magnetic index Ap and the RMS deriations δN_T and δf₀F₂ from the month medians for TEC and f₀F₂ during magnetic storm.