Using global magnetospheric models for simulation and interpretation of Swarm external field measurements
Using global magnetospheric models for simulation and interpretation of Swarm external field measurements
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使用全球磁层模型模拟和解释 Swarm 外场测量
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Raeder
中科院分区：
文献类型：
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作者：
T. Moretto;S. Vennerstrom;N. Olsen;L. Rastätter;J. Raeder
我们使用太阳风-磁层相互作用的全球模型来模拟地球附近地磁场外部贡献的高纬度部分。该模型还提供了相应的电场值。对地磁安静条件进行了建模，以提供与内部磁场建模相关的模拟外部贡献。这些对即将到来的多卫星群任务的设计和规划是非常有价值的。此外，利用Ørsted和CHAMP卫星的观测资料，对一个中等活动时间间隔进行了真实事件模拟。对这一事件的模拟结果与卫星观测结果的比较表明全球模式目前的有效性水平。我们发现该模型很好地再现了第1区电流系统和夜侧第2区电流，然而它始终低估了日侧第2区电流，高估了日侧极帽中水平电电层闭合电流。此外，通过这个例子，我们说明了利用全球模型解释Swarm外部现场观测的巨大好处，同样，使用Swarm测量来测试和改进全球模型的潜力。
We have used a global model of the solar wind magnetosphere interaction to model the high latitude part of the external contributions to the geomagnetic field near the Earth. The model also provides corresponding values for the electric field. Geomagnetic quiet conditions were modeled to provide simulated external contributions relevant for internal field modeling. These have proven very valuable for the design and planning of the upcoming multi-satellite Swarm mission. In addition, a real event simulation was carried out for a moderately active time interval when observations from the Ørsted and CHAMP sattelites were available. Comparisons between the simulation results and the satellite observations for this event demonstrate the current level of validity of the global model. We find that the model reproduces quite well the region 1 current system and nightside region 2 currents whereas it consistently underestimates the dayside region 2 currents and overestimates the horizontal ionospheric closure currents in the dayside polar cap. Furthermore, with this example we illustrate the great benefit of utilizing the global model for the interpretation of Swarm external field observations and, likewise, the potential of using Swarm measuremnets to test and improve the global model.