Global Structure and Seasonal Variations of the Tidal Amplitude in Sporadic-E Layer

被引:5
作者
Tang, Qiong [1 ]
Zhou, Chen [2 ]
Liu, Huixin [3 ]
Du, Zhitao [4 ]
Liu, Yi [2 ]
Zhao, Jiaqi [1 ]
Yu, Zhibin [1 ]
Zhao, Zhengyu [1 ]
Feng, Xueshang [1 ]
机构
[1] Harbin Inst Technol, Inst Space Sci & Appl Technol, Shenzhen, Peoples R China
[2] Wuhan Univ, Dept Space Phys, Sch Elect Informat, Wuhan, Peoples R China
[3] Kyushu Univ, Dept Earth & Planetary Sci, Fukuoka, Japan
[4] Beijing Inst Appl Meteorol, Beijing, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金; 中国博士后科学基金;
关键词
sporadic E; tide; wave-4; structure; RADIO OCCULTATION MEASUREMENTS; E OCCURRENCE RATES; INTERMEDIATE; MIDLATITUDE; SIGNATURE;
D O I
10.1029/2022JA030711
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Constellation Observing System for Meteorology, Ionosphere, and Climate radio occultation S4 indices measurements are used to investigate the global structure and seasonal variations of tidal components in the sporadic-E (Es) layer. The diurnal tidal amplitude in the Es layer intensity and occurrence rate shows a wave-4 longitudinal structure, which is due to the diurnal tidal components of zonal wave numbers s = -3 (eastward, DE3). The wave-4 longitudinal pattern is also observed in the semidiurnal tide during spring and winter, which mostly results from the combination of semidiurnal components of zonal wave numbers s = -2 (eastward, SE2), s = 2 (westward, SW2). In addition, the semidiurnal tidal amplitude in Es layers presents obvious seasonal variability, and it dominates in the northern hemisphere during spring and summer and in the southern hemisphere during autumn and winter. Furthermore, the total semidiurnal tidal amplitude in Es layers in the northern hemisphere is greater than that in the southern hemisphere. Another important finding is that the diurnal tidal pattern at the lower altitude (below 102 km) Es layer is different from that of the higher altitude (above 102 km) Es layer and is also different from that of wind, which supports that the wind shear theory is inapplicable for the Es layer formation at low altitude proposed by many researchers.
引用
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页数:14
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