Computes the gravity. compute_high_altitude(data_set[, mask, inplace]) Computes the US Standard Atmosphere 1976 in the high-altitude region. Computes the temperature and the pressure values at the 8 levels of the low-altitude model. compute_low_altitude(data_set[, mask, inplace]) Computes the US Standard Atmosphere 1976 in the low-altitude region. Computes the mean molar mass in the high-altitude region. Computes the number density of the individual species in the high-altitude region. compute_pressure_low_altitude(h, pb, tb) Computes the pressure in the low-altitude region. Computes the pressure in the low-altitude region when the temperature gradient is non-zero. Computes the pressure in the low-altitude region when the temperature gradient is zero. Computes the temperature gradient in the high-altitude region. Computes the temperature in the high-altitude region. Computes the temperature in the low-altitude region. create(z[, variables]) Creates a US Standard Atmosphere 1976 data set using specified altitudes values. Computes the values of the Eddy diffusion coefficient in the high-altitude region. f_above_115_km(g, t, dt_dz, mi, alpha) Evaluates the function $$f$$ defined by equation (36) in [NNU76] in the altitude region $$115 < z <= 1000$$ km. f_below_115_km(g, t, dt_dz, m, mi, alpha, d, k) Evaluates the function $$f$$ defined by equation (36) in [NNU76] in the altitude region $$86 <= z <= 115$$ km. Initialises the data set. log_interp1d(x, y) Computes the linear interpolation of $$y(x)$$ in logarithmic space. make_profile([levels]) Makes an atmosphere vertical profile based on the US Standard Atmosphere 1976 thermophysical model. tau_function(z_grid[, below_500]) Computes the integral given by equation (40) in [NNU76] at each point of an altitude grid. thermal_diffusion_coefficient(background, ...) Computes the thermal diffusion coefficient values in the high-altitude region. thermal_diffusion_term(species, grid, g, t, ...) Computes the thermal diffusion term of a given species in the high-altitude region. Computes the thermal diffusion term of atomic oxygen in the high-altitude region. Converts geopotential height to (geometric) altitude. Converts altitude to geopotential height. velocity_term(species, grid) Computes the velocity term of a given species in the high-altitude region. Computes the velocity term of atomic oxygen in the high-altitude region. velocity_term_hump(z, q1, q2, u1, u2, w1, w2) Computes the transport term given by equation (37) in [NNU76]. velocity_term_no_hump(z, q1, u1, w1) Computes the transport term given by equation (37) in [NNU76] where the second term is zero.