Fig. 3

Relations between the electron density in the loss cone (< 50 eV) and the mapped outflowing ion number flux in the SZA ranges of a 45°–85°, b 65°–105°, c 85°–125°, and d 105°–145°, and f comparisons among the derived empirical relations in these SZA ranges and the empirical formula derived by Strangeway et al. (2005) (their Eq. 4) (multiplied by a factor of 2.9 to correct for the altitudinal difference of the ion number flux) (dotted gray line). Weighted averages and standard deviations of the logarithmic values are plotted as red crosses and solid lines (as error bars). Dotted lines indicate the empirical relations derived by the fitting. In Fig. 3e, the empirical relations in the SZA ranges of 45°–85°, 65°–105°, 85°–125°, and 105°–145° are shown using red-dashed, orange dashed-dotted-dotted, green dashed-dotted, and blue solid lines, respectively