| The summer polar mesopause is the coldest part of the atmosphere, with temperatures reaching below 130K, in spite of being continuously sunlight. |
| The MU radar can measure the diffusion coefficients in the mesopause region by observing meteor echoes. |
| The normal altitude is about 100 km while the summer mesopause is situated around 87 km for about 4 month. |
| Some experiments were realized to verify the validity of the new technique and to provide the temperature profile in the mesopause region. |
| The figures give a climatology of prevailing horizontal winds at mesopause heights and Collm time series of mesopause wind parameters. |
| It is this alteration in the diffusivity of the mesopause region that allows structures in the electron density to persist at observable scales. |
