Variation of the mesopause observed by SABER/TIMED satellite

We have studied the global mesopause including its seasonal and latitudinal variations of temperature and height as well as the double mesopause phenomenon using the data from SABER instrument on TIMED satellite.The results show that the temperature of the mesopause is between 160 and 180 K while the height of the mesopause is between 85 and 100 km.Both temperature and height of the mesopause are higher in winter and lower in summer.It is revealed that the temperature and height of the mesopause change nearly synchronously.An obvious annual oscillation is seen at high latitudes while semi-annual oscillation at low latitudes and the equator.There exists an asymmetry within northern and southern hemisphere mesopause information.The double mesopause is notable at high latitudes that the mesopause descends promptly from about 100 km to 85 km.The phenomenon of the double mesopause occurs widely within the latitudes 20°N and 30°N according to the long-term average.Our results confirm that the double mesopause is not districted in polar and mid-high latitude areas.The double mesopause generally comes out from 40°S—50°S in the southern hemisphere.We make statistic single temperature profiles in mid-high latitude in summer and compare with averaged winter background temperature profiles.The results show that most second summer lower mesopauses are lower than the winter mesopause by 12~16 km.