The response of N 2 number density in thermosohere during two geomagnetic disturbance on March and October 2012 is analysed in this paper, data taken by Atmospheric Environment Detector on board Tiangong-1 spacecraft are used. Discuss the abnormal increase range, time and space characteristics, low latitude distribution and features of summer and winter hemisphere of N 2 number density during the geomagnetic storms. These results are as follows: the abnormal increase of N 2 number density is closely related to geomagnetic disturbance and its intensity, abnormal increase phenomenon usually appears in the high latitudes region of summer hemisphere, N 2 number density increase during the geomagnetic disturbance is closely related to the mechanism of atmospheric heat.

The spacecraft surface and internal material can adsorb molecules and particles on the ground during material processing , and will quickly release them after entering into the vacuum space .The spacecraft will be contaminated by the deposition layer on its surface due to outgassing in the space environment .This phenomenon has different levels of negative impacts on some engineer-ing systems such as solar energy system , optical remote sensing system , and passive temperature control system .Tiangong 1 target vehicle carried a QCM ( Quartz Crystal Microbalance ) to provide real-time contamination deposition measurements and monitor the changes of contamination deposi -tion for the first time in .It was confirmed that the deposition mass and contamination phenomenon did exist .Analysis of the monitoring data indicated that the deposition mass on the surface increased with the time , especially sharply during the period of rendezvous and docking , and the deposition rise had a negative relationship with the temperature .The effect of attitude transformation needs to be further discussed .

The spacecraft surface and internal material adsorb molecules and particles in the ground environment and materials processing, and will quickly release them in the space. The spacecraft will be contaminated by the deposition layer on its surface due to the release after launched in the space environment. This phenomenon has different levels of negative impacts on some spacecraft engineering systems such as solar energy system, optical remote sensing system, and passive temperature control system. "Tiangong-1" spacecraft carries Quartz Crystal Microbalance (QCM) and measures material deposition on surface and its changes for the first time in manned space orbit, which has achieved monitoring data for more than 2 years since September, 2011. It is confirmed that the deposition material and contamination phenomenon existed. The accumulated change and temperature characteristic of the spacecraft surface deposition layer, as well as the rendezvous and docking affect, and attitude transformation affect have been obtained. In this paper, through the analysis of the monitoring data and the obtained results, it introduces and discusses the deposition change of spacecraft surface contamination.

利用天宫一号的轨道大气环境探测器在2012年12月7日至2013年1月4日,地磁活动平静下的大气密度探测数据,与NRLMSISE-00和JB2008模式进行比较.与实测数据相比,NRLMSISE-00模式整体高估11.6％,而JB2008整体低估9.8％.JB2008模式在逐日变化趋势方面与实测结果更吻合,更好地反映了太阳辐射对热层大气的影响;而NRLMSISE-00在平静期间地磁活动影响大气密度的变化特征上,比JB2008更符合实测结果.实测结果显示冬季半球日峰值出现时间比夏季半球早,JB2008与实测相符,NRLMSISE-00则与实测相反.整体而言,在天宫一号轨道高度、地磁平静期,JB2008模式优于NRLMSISE-00模式.

地震活动一直是人类非常关注的自然灾害事件,其对热层大气密度的影响还不是非常清楚.2008年5月12日中国四川汶川发生震级8.0级强震事件,随后,在6月14日日本本州东部,7月5日鄂霍次克海和7月19日日本本州东海岸发生震级7.0～7.6级强震事件,利用期间中国星载大气密度探测器在630 km高度上就位探测的热层大气密度对探测结果进行综合分析,结果表明,强地震震源中心区域上空附近热层大气密度出现异常降变.在时间上,强地震发生前1～3天内就已开始出现大气密度降变,强地震发生日附近降变达到谷值,降变比达0.40～0.65.这种降变的纬度区域范围震前位于强震中心所处纬度的±3°～±9°,强震发生当日扩大到±8°～±20°.