Examining the Wind Shear Theory of Sporadic E With ICON/MIGHTI Winds and COSMIC‐2 Radio 2 Occultation Data
Examining the Wind Shear Theory of Sporadic E With ICON/MIGHTI Winds and COSMIC‐2 Radio 2 Occultation Data
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DOI：
10.1029/2021gl096202
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发表时间：
2021-12
影响因子：
5.2
通讯作者：
Y. Yamazaki;C. Arras;S. Andoh;Y. Miyoshi;H. Shinagawa;B. Harding;C. Englert;T. Immel;S. Sobhkhiz-Miandehi;C. Stolle
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文献类型：
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作者：
Y. Yamazaki;C. Arras;S. Andoh;Y. Miyoshi;H. Shinagawa;B. Harding;C. Englert;T. Immel;S. Sobhkhiz-Miandehi;C. Stolle
风切变理论被广泛接受为零星E（Es）层形成的解释，但由于缺乏中性风测量，Es与当地风切变的直接比较受到限制。本研究使用COSMIC-2无线电掩星测量的信噪比剖面和电离层连接探测器的中性风剖面的同时测量，研究了垂直风切变对Es的作用。观测到Es出现率和平均S4指数与东风的负垂直切变相关，为风切变理论提供了观测支持。当垂直风切变为正时，也能观测到Es，这被解释为金属离子层产生的时间较早。
The wind shear theory is widely accepted as an explanation for the formation of a sporadic E (Es) layer, but the direct comparison of Es with the local wind shear has been limited due to the lack of neutral wind measurements. This study examines the role of the vertical wind shear for Es, using signal‐to‐noise ratio profiles from COSMIC‐2 radio occultation measurements and concurrent measurements of neutral wind profiles from the Ionospheric Connection Explorer. It is observed that the Es occurrence rate and average S4 index are correlated with the negative vertical shear of the eastward wind, providing observational support for the wind shear theory. Es can be observed even when the vertical wind shear is positive, which is interpreted as metallic ion layers generated at an earlier time.