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(a) Scatter plots of the percentage deviation of observed foF2 from the fitted values, δfoF2, versus <ap>24 h at Petropavlovsk in March equinox season; the red line is the linear fitting of the dots for the geomagnetic activity level of <ap>24 h<30. (b) Latitude variations of the fitting slope of δfoF2 versus <ap>24 h; the red, blue, black, and green lines correspond to the seasonal conditions of March equinox, June Solstice, September equinox, and December solstice, respectively.
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