Reconciling the centimeter- and millimeter-wavelength ammonia absorption spectra under jovian conditions: Extensive millimeter-wavelength measurements and a consistent model

► Laboratory measurements of the mm-wavelength opacity of ammonia under simulated jovian conditions. ► New model to characterize the opacity of ammonia under jovian conditions in the 1-30 cm wavelength range at pressures up to 20 bars and temperatures from 200 to 500 K and in the 1 mm to 1 cm wavelength range at pressures up to 3 bars and temperatures from 200 to 300 K. ► Measurements and model will enable better interpretation of the jovian emission spectra.