Oceans are a major source of waves in the thermosphere
Oceans are a major source of waves in the thermosphere
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海洋是热层波浪的主要来源
DOI：
10.1002/2016ja022357
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
T. Bullett
中科院分区：
文献类型：
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作者：
N. Zabotin;O. Godin;T. Bullett
Godin等人（2015）最近的理论分析表明，亚重力波（IGW，即，海洋中周期大于30 s的表面重力波）可以辐射声重力波（AGW），并占热层中观察到的周期约为5 min至3 h的波活动的重要部分。在本文中，我们使用位于美国东海岸的两个深海海啸评估和报告站以及位于弗吉尼亚州沃洛普斯岛的Dynasonde雷达系统的数据，报告了由海洋驱动的热层波的强有力的实验演示。在9个月的观测期内，IGW和AGW谱幅的变化在宽范围的频率（0.2-3.2 mHz）和高度（140-190 km）内表现出大的、统计上显著的相关性。峰值相关值（~0.43）表明，海洋辐射波是热层波活动的主要组成部分。
Recent theoretical analysis by Godin et al. (2015) led to the suggestion that infragravity waves (IGWs, i.e., surface gravity waves in the ocean with periods longer than 30 s) can radiate acoustic‐gravity waves (AGWs) and account for a significant part of the wave activity observed in the thermosphere with periods between about 5 min and 3 h. In this paper, we report a strong experimental demonstration of thermospheric waves being driven by the ocean using data from two Deep‐ocean Assessment and Reporting of Tsunamis stations located off the US East Coast and Dynasonde radar system located at Wallops Island, Virginia. Over a 9 month observation period, variations of IGW and AGW spectral amplitudes demonstrate large, statistically significant correlation in a broad range of frequencies (0.2–3.2 mHz) and altitudes (140–190 km). Peak correlation values (~0.43) indicate that waves radiated by the ocean represent a major constituent of thermospheric wave activity.