Unexpected space weather causing the reentry of 38 Starlink satellites in February 2022
Unexpected space weather causing the reentry of 38 Starlink satellites in February 2022
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DOI：
10.1051/swsc/2022034
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发表时间：
2022-12-23
影响因子：
3.3
通讯作者：
Miyoshi, Yasunobu
中科院分区：
文献类型：
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作者：
Kataoka, Ryuho;Shiota, Daikou;Miyoshi, Yasunobu
2022年2月初，38颗Starlink卫星意外重返大气层，与中等磁暴的发生有关。日冕物质抛射（CME）的结构知之甚少，在意想不到的时间引起了磁暴。因此，更好地了解日冕物质抛射的小结构对现代空间天气预报是必要的。在这一事件中，在200公里的高度观察到空气阻力增加了“高达50%”，妨碍了卫星的安全运行。虽然NRLMSIS2.0经验模型预测的质量密度增强小于25%，在目前的中等磁暴，实时GAIA模拟显示的质量密度增强高达50%。此外，GAIA的实时模拟表明，在200公里高度的实际热层扰动可能发生在比以前认为的更广泛的区域，其幅度更大。
The accidental reentry of 38 Starlink satellites occurred in early February 2022, associated with the occurrence of moderate magnetic storms. A poorly understood structure of Coronal Mass Ejections (CMEs) caused the magnetic storms at unexpected timing. Therefore, a better understanding of minor CME structures is necessary for the modern space weather forecast. During this event, the "up to 50%" enhancement of air drag force was observed at similar to 200 km altitude, preventing the satellites' safety operations. Although the mass density enhancement predicted by the NRLMSIS2.0 empirical model is less than 25% under the present moderate magnetic storms, the real-time GAIA simulation showed a mass density enhancement of up to 50%. Further, the real-time GAIA simulation suggests that the actual thermospheric disturbances at 200 km altitude may occur with larger amplitude in a broader area than previously thought.