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The determination of satellite orbital decay from POD data during geomagnetic storms
Space Weather ( IF 3.8 ) Pub Date : 2021-04-02 , DOI: 10.1029/2020sw002664
Ruoxi Li 1, 2, 3 , Jiuhou Lei 1, 2, 3
Affiliation  

In our previous study (Li et al., 2017), we derived the satellite energy‐decay with a 20‐minute resolution based on the Precise Orbit Determination (POD) data, using a proximate analytic approach to represent the time variation gravitational potential. In this follow‐up study, we improved the previous approach and calculated the POD‐based energy‐decays by using a numerical integration approach. Based on the precise energy‐decays, the orbital decays and decay rates with higher accuracy and resolution were further derived. The relative deviations of the orbital decays are generally less than 10% with respect to the accelerometer‐reference. The satellite orbital decays and decay rates derived from this approach were used to study the effects of geomagnetic activities and background density on the orbital changes. Our results show that, during the severe November 2003 storm, the storm‐induced orbital decay rate increased by a factor of 8 with respect to the quiet‐time reference. This POD‐based integration approach was also applied to study the orbital changes of multiple satellites at different altitudes during the September 2017 moderate storm. It is found that the storm‐induced orbital decay rates of Swarm‐B, Swarm‐A, and GRACE satellites increased by 100%‐150% depending on their altitudes. Overall, the results suggest that our integration approach has better performance than the previous approach in deriving the orbital decay rate at solar minimum or at high altitude when the atmospheric density is relatively low.

中文翻译:

利用地磁暴期间POD数据确定卫星轨道衰减

在我们之前的研究中(Li等人,2017),我们基于精确轨道确定(POD)数据,使用近似分析方法来表示时间变化引力,得出了20分钟分辨率的卫星能量衰减。在此后续研究中,我们改进了先前的方法,并使用数值积分方法计算了基于POD的能量衰减。在精确的能量衰减的基础上,进一步推导了轨道衰减和衰减率,具有更高的精度和分辨率。相对于加速度计参考,轨道衰减的相对偏差通常小于10%。从这种方法得出的卫星轨道衰减和衰减率用于研究地磁活动和背景密度对轨道变化的影响。我们的结果表明,在2003年11月的严重风暴中,风暴引起的轨道衰减率相对于静时基准增加了8倍。这种基于POD的集成方法还用于研究2017年9月中度暴风雨期间不同高度的多颗卫星的轨道变化。发现,由风暴引起的Swarm-B,Swarm-A和GRACE卫星的轨道衰减率增加了100%-150%,具体取决于它们的高度。总体而言,结果表明,我们的积分方法在推算太阳密度最小或大气密度相对较低的高海拔地区的轨道衰减率时,比以前的方法具有更好的性能。这种基于POD的集成方法还用于研究2017年9月中度暴风雨期间不同高度的多颗卫星的轨道变化。发现,由风暴引起的Swarm-B,Swarm-A和GRACE卫星的轨道衰减率增加了100%-150%,具体取决于它们的高度。总体而言,结果表明,我们的积分方法在推算太阳密度最小或大气密度相对较低的高海拔地区的轨道衰减率时,比以前的方法具有更好的性能。这种基于POD的集成方法还用于研究2017年9月中度暴风雨期间不同高度的多颗卫星的轨道变化。发现,由风暴引起的Swarm-B,Swarm-A和GRACE卫星的轨道衰减率增加了100%-150%,具体取决于它们的高度。总体而言,结果表明,我们的积分方法在推算太阳密度最小或大气密度相对较低的高海拔地区的轨道衰减率时,比以前的方法具有更好的性能。
更新日期:2021-04-04
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