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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Thermosphere density variations due to the 15–24 April 2002 solar events from CHAMP/STAR accelerometer measurements
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Thermosphere density variations due to the 15–24 April 2002 solar events from CHAMP/STAR accelerometer measurements

机译：热电离层密度变化由于15 - 242002年4月从冠军/星太阳能事件加速度计测量

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摘要

Thermosphere densities near 410 km altitude between ±87° latitude and near 0430 and 1530 local time from the accelerometer experiment on the CHAMP satellite are used to elucidate the response to three coronal mass ejections occurring on 17, 19, and 21 April 2002. Comparisons of the global responses with the NRLMSISE00 empirical model and the NCAR TIEGCM are performed and interpreted. An enhanced daytime response in comparison to TIEGCM on 17 April is found that is suggestive of preconditioning of the atmosphere due to enhanced solar EUV fluxes maximizing on 13 April. Out of several solar wind parameters and geophysical indices that were examined, the highest correlation with thermosphere densities occurred with respect to the magnitude of the interplanetary magnetic field as measured by the ACE spacecraft. Wave-like structures with scales ranging from 100s to 1000s of kilometers are also revealed in the CHAMP data. These structures are primarily a nighttime phenomena, and the associated total variance is correlated with magnetic activity throughout the 15–24 April 2002 period. The NCAR TIEGCM was utilized to provide the basis for interpreting the equatorward propagation of large-scale traveling atmospheric disturbance (TADs). Following a sudden increase in magnetic activity and high-latitude heating, TADs were launched from both hemispheres, traveled toward the equator with phase speeds of order 800 m s?1, constructively interfered near the equator to produce a total density perturbation of ～20%, and then passed through each other and into the opposite hemisphere. Perspectives on future applications of CHAMP accelerometer data to elucidate magnetic storm-related perturbations of the thermosphere are outlined.
机译：热电离层密度接近410公里的高度在±87°附近的纬度和0430年和1530年当地时间从加速计实验CHAMP卫星用于阐明应对三个日冕物质抛射发生在17岁,2002年4月19日和21。全球反应的比较NRLMSISE00实证模型和NCAR TIEGCM执行和解释。17日白天响应TIEGCM相比4月是发现,是暗示由于增强预处理的大气4月13日太阳能EUV通量最大化。几个太阳风和地球物理参数检查的指标,最高与热电离层密度发生关联的大小行星际磁场测量的ACE飞船。从100年代到1000年代的公里也在冠军的数据。主要是夜间的现象,总方差与相关在2002年4月15 - 24磁场活动时期。解释朝赤道方向的基础传播的大型旅游大气干扰(TADs)。在磁场活动和高纬度地区加热,TADs发射两个半球,旅行对赤道与阶段的速度800年代的订单吗?赤道的总密度~ 20%的扰动,然后通过彼此相反的半球。冠军的视角对未来应用加速度计数据来阐明磁场马萨诸塞州的热电离层扰动概述了。

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