Accuracy of Earth's Thermospheric Neutral Density Models
Accuracy of Earth's Thermospheric Neutral Density Models
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DOI：
10.2514/6.2006-6167
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发表时间：
2006-08
期刊：
影响因子：
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通讯作者：
F. Marcos;B. Bowman;R. Sheehan
中科院分区：
文献类型：
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作者：
F. Marcos;B. Bowman;R. Sheehan
[摘要]大气阻力仍然是低空卫星精确定轨的主要不确定性因素。经验模型用于估算卫星阻力。在过去的35年里，模式的精度几乎没有提高。一种新的Ja chia -Bowman 2006 （JB2006）经验模型已经作为空军航天司令部高精度卫星阻力模型（HASDM）计划的一部分被开发。JB2006模型的重要新特征是基于卫星EUV和FUV传感器的太阳指数和改进的半年变化。这个新模型与历史模型、海拔、纬度、当地时间、一年中的哪一天、太阳和地磁条件进行比较。数据来自一套独特的高精度热层中性密度，其一日分辨率来自对38颗卫星的跟踪。估价是在1997年至2004年期间进行的，当时有JB2006的具体太阳指数。这些结果提高了对当前太阳输入与热层响应之间的定量关系的理解。加入JB2006的新配方能够更准确地指定热层密度。
[Abstract] Atmospheric drag remains the dominant uncertainty for low altitude satellite precision orbit determination . Empirical models are used to estimate satellite drag. Model accuracies have shown little improvement in the past 35 years. A new Ja cchia -Bowman 2006 (JB2006) empirical model has been developed as part of the Air Force Space Command’s High A ccuracy Satellite Drag Model (HASDM) program. Significant new model features of JB2006 are solar indices based on satellite EUV and FUV sensor s and an improved semiannual variation. This new model is compared to historic models vs altitude, latitude, local time , day of year and solar and geomagnetic conditions . Data are from a unique high accuracy set of thermospheric neutral densities with one -day r esolution, obtained from tracking of 38 satellites. The e valuation is carried out for the period 199 7 to 2004 , when the specific solar indices for JB2006 were available . The results provide improved understanding of quantitative relations between current s olar inputs and t he response of the thermosphere . New formulations incorporated into the JB2006 lead to a capability to more accurately specify thermospheric density .