Solar‐terrestrial coupling evidenced by periodic behavior in geomagnetic indexes and the infrared energy budget of the thermosphere
Solar‐terrestrial coupling evidenced by periodic behavior in geomagnetic indexes and the infrared energy budget of the thermosphere
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DOI：
10.1029/2007gl032620
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发表时间：
2008-03
影响因子：
5.2
通讯作者：
M. Mlynczak;F. Martín-Torres;C. Mertens;B. Marshall;R. Thompson;J. Kozyra;E. Remsberg;L. Gordley;J. Russell;T. Woods
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文献类型：
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作者：
M. Mlynczak;F. Martín-Torres;C. Mertens;B. Marshall;R. Thompson;J. Kozyra;E. Remsberg;L. Gordley;J. Russell;T. Woods
本文研究了在100 ~ 200 km高度的热层中，由二氧化碳（15 μm）和一氧化氮（5.3 μm）辐射的每日全球功率（W）的时间序列。还研究了同一海拔地区0 ~ 175 nm波长范围内日吸收太阳紫外线功率的时间序列。红外数据来自SABER仪器，太阳数据来自SEE仪器，两者都安装在美国航天局的TIMED卫星上。时间序列涵盖了从2002年到2006年的近5年。红外和太阳时间序列显示出辐射和吸收功率的下降，与当前11年太阳周期的下降阶段一致。红外时间序列还表现出在太阳能时间序列中不明显的高频变化。光谱分析显示，红外数据具有统计学显著的9天周期性，但太阳数据没有。日地磁指数Ap和Kp的时间序列也存在很强的9天周期。这些9天的周期与太阳上日冕洞的复发有关。这些结果表明，太阳高层大气和热层红外能量收支之间存在直接耦合。
We examine time series of the daily global power (W) radiated by carbon dioxide (at 15 μm) and by nitric oxide (at 5.3 μm) from the Earth's thermosphere between 100 km and 200 km altitude. Also examined is a time series of the daily absorbed solar ultraviolet power in the same altitude region in the wavelength span 0 to 175 nm. The infrared data are derived from the SABER instrument and the solar data are derived from the SEE instrument, both on the NASA TIMED satellite. The time series cover nearly 5 years from 2002 through 2006. The infrared and solar time series exhibit a decrease in radiated and absorbed power consistent with the declining phase of the current 11‐year solar cycle. The infrared time series also exhibits high frequency variations that are not evident in the solar power time series. Spectral analysis shows a statistically significant 9‐day periodicity in the infrared data but not in the solar data. A very strong 9‐day periodicity is also found to exist in the time series of daily Ap and Kp geomagnetic indexes. These 9‐day periodicities are linked to the recurrence of coronal holes on the Sun. These results demonstrate a direct coupling between the upper atmosphere of the Sun and the infrared energy budget of the thermosphere.