论文部分内容阅读
本文利用CHAMP卫星加速度仪测量数据,计算和分析2003年11月20～21日大磁暴期间大气质量密度扰动的全球分布特征;研究暴时变化与极区大尺度对流引起的全球焦耳加热总功率及环电流指数SYM-H之间的关系.结果表明,磁暴期间400km高度上热层大气质量密度大幅度上升,NRLMSISE-00模式预测值与此相比有很大差别;暴时大气密度的增大存在昼/夜半球不对称性:白天强于夜晚,且白天随纬度的分布呈现出比较复杂的图像,在赤道附近和南半球中低纬区(10°N～50°S)大气密度增大较强,并呈双峰分布,两个峰分别位于0°和45°S,另外在极区也出现大气密度扰动的局部极大,而在夜晚,大气密度变化南北半球比较对称,在赤道低纬区大气密度增大较强;互相关分析表明,中低纬区大气密度变化滞后于全球焦耳加热总功率3～7h,滞后于环电流指数(SYM-H)0～3h,与二者存在很强的相关,表明极区焦耳加热和赤道环电流过程对暴时热层大气密度扰动有重要影响.
In this paper, we use the data of CHAMP satellite accelerometer to calculate and analyze the global distribution of atmospheric mass density perturbations during the large magnetosphere from November 20 to 21, 2003; study the global Joule heating total power caused by typhoon and large- And the current index SYM-H.The results show that the mass density of thermal layer on the 400 km altitude during magnetic storms greatly increases, and the predicted value of NRLMSISE-00 model is quite different from that of the current model. The increase of atmospheric density during the storm There is daytime / nighttime hemispheric asymmetry: the daytime is stronger than the nighttime, and the distribution of the daytime is more complicated with the latitude. The atmospheric density near the equator and at the mid-low latitude of the southern hemisphere (10 ° N ~ 50 ° S) Strong and bimodal, the two peaks are located at 0 ° and 45 ° S, respectively. In addition, there is also a local maximal atmospheric density disturbance in the polar region. In the night, atmospheric density changes more symmetrically in the northern and southern hemispheres, The correlation analysis shows that the atmospheric density changes in the middle and low latitudes lag behind the global Joule heating total power of 3 ~ 7h, lagging behind the ring current index (SYM-H) 0 ~ 3h, and the two exist Strong correlation, indicating that the polar focal Heating process and equatorial ring current has an important influence on the thermal layer atmospheric density perturbation storm.