Nighttime Exospheric Temperature Maximum During Quiet Time of Solar Minimum Period Based on Swarm Satellites
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摘要: 逃逸层大气温度的夜间增强现象是高层大气温度变化特征的重要组成部分,有助于增加对大气温度的认识以及对大气中性模式的完善。先前,由于高热层温度数据的匮乏,对中性温度夜间增强现象的研究主要基于单点及联合观测的地基FPI台站以及各种中性大气模式的现象及机制的模拟研究。本文的工作通过Swarm卫星加速度计的中性密度数据反演得到的逃逸层温度进行了太阳活动低年时期的温度夜间增强现象的全球变化和季节变化的统计。结果显示,太阳活动越强,夜间温度增强出现的概率和强度越大,出现多个夜间增强峰值的概率也更大。F10.7为80~100之间时,四个季节都出现了温度的夜间增强现象,并在不同的经度扇区均出现,但形态和强度有差异;而F10.7小于80时,春季和秋季的夜间增强现象更强、持续时间更长,而夏冬季则更弱。此外,是否出现夜间增强现象在不同扇区存在差异。Abstract: The nighttime exospheric temperature maximum is an important part of the characteristics of upper atmospheric temperature variations, which contributes to the understanding of atmospheric temperature and the improvement of the neutral atmosphere model. Previously, due to the scarcity of upper thermosphere temperature observations, studies of the nighttime exospheric temperature maximum were mainly based on single-site and joint observation of ground-based FPI stations as well as simulation studies of the phenomena and mechanisms of various neutral atmosphere models and ionospheric models. The work in this paper carries out the statistics of global and seasonal variations of the nighttime exospheric temperature maximum during solar minimum period by deriving the exospheric temperature obtained from the neutral density of the Swarm satellite accelerometer. The results show that the stronger the solar activity is, the higher the probability and intensity of the occurrence of the nighttime exospheric temperature maximum, and the higher the probability of multiple maximum peaks. When F10.7 is between 80 and 100, the temperature enhancement occurs in all four seasons and in different longitude sectors, but with differences in morphology and intensity. For F10.7 less than 80, the temperature enhancement is stronger and longer in spring and fall, and weaker in summer and winter. In addition, the presence or absence of nocturnal enhancement varies from sector to sector.
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Key words:
- Neutral Temperature /
- Exosphere /
- Solar Minimum /
- Quiet Time /
- Nighttime Temperature Maximum /
- Longitudinal Variation
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