A simulation of the quasi-two-day wave and its effect on variability of summertime mesopause temperatures

► Quasi two-day wave (QTDW) is studied using a multi-year simulation of the CMAM. ► The QTDW in the CMAM exhibits a variable phase speed over the summer season. ► A 2-day wave index is defined using EOF analysis. ► The QTDW is found to be a source of variability of summer mesopause temperatures.