n_upper_LTE

Physics.Radiation.n_upper_LTE(n_species, transition, temp)

Upper state population of a transition

Returns the population density of the upper state of the line whose data are given in the dictionary ‘transition’, assuming LTE at the temperature ‘temp’.

:param n_species : column density of the species (cm^-3 or m^-3) :type n_species : float

:param transition : spectral line data :type transition : dict

:param temp : temperature in K :type temp float or int

Returns

float (same units as n_species)