Fig. 5

a MLT-height variation in the Na deviation. b Same as a, but insignificant data (\(\le 98\%\) probability) are shaded by gray color. c MLT variation in the CNA deviation. Red points indicate data which have significant differences (\(>98\%\) probability) in the median values between the quiet and active days. For both the Na and CNA deviations, negative values indicate decrease during the active days, and positive values indicate increase during the active days