Analysis of Morphology of the F2-layer Storm During the First Ten Days of February, 1986

This paper presents the morphology of F₂-layer storms occurred during the first ten days of February,1986.It is concluded that during the storm time,there was the phenomenon of spread-F covering a large area,h'F was lifted,f₀F₂ exhibited,a negative main phase behavior in mid-latitude,but positive or negative main phase behavior in low latitude,the starting and ending time of main phase varies as in different places,and that the main phase lasts obviously longer in mid-latitudes than in low latitudes.It is also shown that with respect to the primary phase,the features of main phase in various areas are morphologically similar to each other on the whole.