Fig. 6: Scatter plots of lightning flash rate versus cloud ice fraction in the four frequent lightning regions.
From: Cloud ice fraction governs lightning rate at a global scale
a North America, b Asia, c South America, and d South Africa. In addition, lightning flash rate as a regression equation of cloud ice fraction (pink curves), the fitting coefficients (\({{{{{\rm{a}}}}}}\), \({{{{{\rm{\alpha }}}}}}\), \({{{{{\rm{b}}}}}}\), and \({{{{{\rm{\beta }}}}}}\) in Eq. (1) (“Methods”)), as well as the calculated \({x}_{{{{{{\rm{c}}}}}}}\) and \({L}_{{{\max }}}\) in the four regions are presented in the figures. R2 and RMSE are goodness-of-fit index and root mean square error, respectively.
