CalovGreveIntegrand distance_factor_paleo distance_factor_present_day hour_angle insolation solar_declination_paleo solar_declination_present_day solar_longitude

distance_factor_present_day() static double pism::surface::details::distance_factor_present_day ( double  year_fraction ) static The unit-less factor scaling top of atmosphere insolation according to the Earth's distance from the Sun. The returned value is (d_bar / d)^2, where d_bar is the average distance from the Earth to the Sun and d is the current distance at a given time. Implements equation 2.2.9 from Liou (2002). Liou states: "Note that the factor (a/r)^2 never departs from the unity by more than 3.5%." (a/r in Liou is equivalent to d_bar/d here.) Definition at line 139 of file DEBMSimplePointwise.cc. References b0. Referenced by pism::surface::DEBMSimplePointwise::orbital_parameters().