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How do the solar activities affect the temperature of mesopause? TEXT SIZE: A A A
Date:2016.09.19 Author:TANG Chaoli Clicks:

Mesopause, the layer separating the mesosphere from the thermosphere, is one of the main properties of the Earths upper atmosphere. Because the thermal structure at the upper atmosphere is greatly impacted by the abundance of solar energy striking the Earth from the constantly changing Sun, variations arising on decadal and even longer timescales may play a significant role in long-term trend estimates. One of the major sources of decadal variability in the upper atmosphere is the 11 year solar activity cycle. The thermal structure and energy balance of upper atmosphere are dominated by solar activity cycle. The mesopause is the same. The cold-point mesopause (CPM) is defined as the region where kinetic temperature is minimum, in which the transport and exchange of energy occur through subtle and complex processes. The temperature of CPM (T-CPM) is the most important parameter for characterizing this transition from the mesosphere to the thermosphere, and the variation of temperature may be related with the solar activities. If it were true, how do the solar activities affect the temperature of mesopause?

A recent research gave the answer. It was performed in the research group led by Prof. WEI Heli from the Atmospheric Optics Research Center in Anhui Institute of Optics and Fine Mechanics (AIOFM), Chinese Academy of Sciences (CAS). Dr. TANG Chaoli et al. in the group analyzed the temperature profiles of the level 2A data set collected by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) from 2002 to 2015. And they presented: T-CPM is significantly sensitive to solar activity; the close relationship between solar activity and temperature structure in mesopause regions do exist; there is a nonuniform latitudinal and longitudinal distribution of the response coefficients of T-CPM to the solar activities; the T-CPM changes due to solar activity changes assumed to be associated with the 11 year cycle are large. Moreover, the global distribution of the response of T-CPM to solar activity and their correlation coefficient was firstly given. These results demonstrated the potentially significant physical mechanism which may link the 11 year solar cycle and the dynamic state of the mesopause.

 

This research entitled “The response of the temperature of cold-point mesopause to solar activity based on SABER data set has been published in J. Geophys. Res. SpacePhysics.

This work was partly supported by the National Natural Science Foundation of China.

Full Text (HTML):http://onlinelibrary.wiley.com/doi/10.1002/2016JA022538/full

 

 

 

                    

 

The response of the temperature of cold-point mesopause (T-CPM) to solar activity.

(a) The scatterplot of the annual mean of T-CPM and solar flux index (F10.7) during 2002-2015; (b) Latitudinal distribution of solar response of T-CPM, and the vertical bars show the fluctuation range of solar response, (c) Spatial distribution of 14yr average of T-CPM, and contour interval is 2K; (d) Spatial distribution of the solar response of T-CPM, and contour interval is 1 K/100SFU. (Image by TANG Chaoli)

 

 

 

 

 
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