Study On The Thermosphere Wind Field With The All-sky Fabry-perot Interferometer

The thermosphere is the fourth layer of the Earth’s atmosphere which is an important region for the atmosphere. Overlapped with the part of the region of ionosphere, the thermosphere can not only get energy and momentum from the lower layer by the gravity wave and tide, but also from the solar wind through the magnetosphere, therefore, it behaves in the severe manner. The study on the thermosphere is very helpful to get the information of the atmospheric dynamical structure, it is also important for the complement of the space weather knowledge, and guarantee the safety for the spacecraft that get through this region. Neutral wind is one of the vital atmospheric parameters, involved in kinds of the chemical and physical process, which can change the local structure of the atmosphere, especially in the polar region.With the support of the Chinese Arctic And Antarctic Administration and Polar Research Institute of China, A compact all-sky Fabry-Perot interferometer, which is produced by Wuhan University was installed at Chinese Yellow River Station in Ny-Alesund, Svalbard on November2010, and used for the observation of winter season. Base on the data from the all sky Fabry-Perot interferometer in Chinese Yellow River Station, it is feasible to study o the neutral wind of the thermosphere in arctic region.During the140days of winter from2011to2012,118-day all-sky interference data acquired including the57valid data that could be calculated into wind velocity. The database was divided into two periods:(1) The OI557.7nm emission was observed from December1,2011to January12,2012;(2) The OI630.0nm emission was observed from January13,2012to February26,2012. The layers of the different wavelengths were assumed to be110km and240km respectively.The dynamical process of the thermosphere and the corresponding observation instruments were given as well as the relationship with the ionosphere. Two types of Fabry-Perot interferometers were introduced with equipment compositions, following the methods respectively. The data process was described based on the inversion from the all sky interference images into the wind field. The interference images from the computer simulation were used to verify the correctness of the data process.The results form the Yellow River Station was displayed with the form of line-of-sight wind, vertical wind and horizontal wind to describe the behavior the wind. Furthermore, the wind pattern in vicinity of the aurora arc was also stated. Besides, the solar radiation and the disturbed geomagnetism were also compared with the changes of the wind on the different directions.The analysis was focus on the influence on the pattern of the wind when the aurora arc appeared. The possible reasons for the wind were explained the response of the wind to the solar radiation and disturbed geomagnetism. Ion drag and Joule heating were the two important processes considered in the analysis of the effect and influence on the wind pattern.