homopause

plural homopauses

1. The level of an atmosphere below which its constituent molecules are well mixed

   The H#95;3#43; peak in EGPs with upper atmospheres where H#95;2 is dissociated under strong stellar illumination is pushed to altitudes below the homopause, where this ion is likely to be destroyed through reactions with heavy species.

   2016, J. M. Chadney, M. Galand, T. T. Koskinen, S. Miller, J. Sanz-Forcada, Y. C. Unruh, R. V. Yelle, “EUV-driven ionospheres and electron transport on extrasolar giant planets orbiting active stars”, in arXiv