Comparison and analysis of the thermospheric density between TIEGCM and CHAMP during a severe geomagnetic storm
-
摘要: 利用NCAR-TIEGCM模式计算了2003年11月20—21日强磁暴期间410km高度上的大气密度,并与CHAMP/STAR加速度计反演数据进行对比和分析. 结果表明,模式结果能够准确反映磁暴期间大气密度的分布和变化情况,与实测结果在变化趋势和量级上具有较好的一致性,但在精细结构和数值大小上仍存在一定差异. 模式低估了磁暴期间大气密度的增幅,实测大气密度增幅高达250%~400%,而模式结果为100%~125%. 模式结果与实测数据的偏差在高纬地区高于低纬地区,日侧高于夜侧. 通过模式和实测数据的分析发现,磁暴期间大气密度扰动具有日夜侧和南北半球不对称性. 此外,模式能够准确反映磁暴期间大气密度扰动从高纬向低纬的传播以及大气密度对SYM-H指数响应的延迟特性.Abstract: The thermospheric densities at the altitude of 410km during the geomagnetic storm on Nov. 20—21, 2003 are calculated by NCAR-TIEGCM model, and the results are compared and analyzed with the observational data from CHAMP/STAR. The results show that the model can exactly represent the distribution and variation of the density during geomagnetic storm, and the model results have a good consistency with the CHAMP data in trends and orders. But some differences do exist in detailed structure and magnitude. The model underestimated the increases of the density during geomagnetic storm with the values of 100%~125%, instead of the 250%~400% observed by CHAMP. The deviations between the model and CHAMP at high latitude are bigger than those of low latitude, and dayside bigger than nightside. It is also found that the density disturbance during geomagnetic storm presents day-night asymmetry and Southern-Northern hemisphere asymmetry. The model can exactly represent the propagation of the density disturbance from high latitude to low latitude, and the time delay in response of the density to geomagnetic storm.
-
Key words:
- Thermospheric density /
- Geomagnetic storm /
- TIEGCM model /
- CHAMP satellite
-
[1] Prolss G W, Roemer M, Slowey J W. Dissipation of solar wind energy in the Earth's upper atmosphere: the geomagnetic activity effect[J]. Adv. Space Res., 1988, 8(5/6):215-261 [2] Fuller Rowell T J, Codrescu M V, Roble R G, et al. How does the thermosphere ionosphere react to a geomagnetic storm[M]// Geophysical Monograph Series. Washington D C: American Geophysical Union, 1997:203-225 [3] Emmert J T. A long-term data set of globally averaged thermospheric total mass density[J]. J. Geophys. Res., 2009, 114, doi: 10.1029/2009JA014102 [4] Lei J, Thayer J P, Lu G, Burns A G, Wang W, Sutton E K, Emery B A. Rapid recovery of thermosphere density during the October 2003 geomagnetic storms[J]. J. Geophys. Res., 2011, 116, doi: 10.1029/2010JA016164 [5] Forbes J M, Lu G, Bruinsma S, Nerem R S, Zhang X. Thermosphere density variations due to the 15—24 april 2002 solar events from CHAMP/STAR accelerometer measurements[J]. J. Geophys. Res., 2005, 110, doi: 10.1029/2004JA010856 [6] Liu H, Lühr H. Strong disturbance of the upper thermospheric density due to magnetic storms: CHAMP observations[J]. J. Geophys. Res., 2005, 110, doi:10.1029/ 2004JA010908. [7] Reigber C, et al. CHAMP mission status and perspectives[J]. Eos. Trans. AGU, 2002, 30:129-134 [8] Reigber C, Lühr H, Schwintzer P. CHAMP mission status[J]. Adv. Space Res., 2002, 30(2):129-134 [9] Bruinsma S, Tamagnan D, Biancale R. Atmospheric densities derived from CHAMP/STAR accelerometer observations[J]. Planet. Space Sci., 2004, 52(4):297-312 [10] Bruinsma S, Biancale R. Total densities derived from accelerometer observations[J]. J. Spacecr. Rock., 2003, 40:230-236 [11] Roble R G, Ridley E C, Richmond A D, Dickinson R E. A coupled thermosphere/ionosphere general circulation model[J]. Geophys. Res. Lett., 1988, 15:1325-1328 [12] Richmond A D, Ridley E C, Roble R G. A thermosphere/ionosphere general circulation model with coupled electrodynamics[J]. Geophys. Res. Lett., 1992, 19:601-604 [13] Qin Guotai, Sun Lilin, Zeng Hong, et al. Disturbance of the upper atmospheric density during August 24, 2005 severe geomagnetic storm event[J]. Chin. J. Space Sci., 2008, 28(2):137-141. In Chinese (秦国泰, 孙丽琳, 曾宏, 等. 2005年8月24日强 磁暴事件对高层大气密度的扰动[J]. 空间科学学报, 2008, 28(2):137-141) [14] Zhou Yunliang, Ma Shuying, Lühr H, et al. Changes of thermospheric mass density and their relations with Joule heating and ring current index during Nov. 2003 superstorm——-CHAMP observations[J]. Chin. J. Geophys., 2007, 50(4):986-994. In Chinese (周云良, 马淑英, Lühr H, 等. 2003年11月超强磁暴热层大气密度扰动及 其与焦耳加热和环电流指数的关系——-CHAMP卫星观测[J]. 地球物理学报, 2007, 50(4):986-994)
点击查看大图
计量
- 文章访问数: 1444
- HTML全文浏览量: 84
- PDF下载量: 2298
- 被引次数: 0