Infrasound from convective storms. III. Propagation to the ionosphere
Infrasound from convective storms. III. Propagation to the ionosphere
复制标题
对流风暴产生的次声。
DOI：
10.1121/1.380942
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发表时间：
1976
影响因子：
2.4
通讯作者：
T. Georges
中科院分区：
文献类型：
--
作者：
R. Jones;T. Georges
我们对电离层中观测到的、被认为受到严重雷暴辐射的次声的频谱特征进行了数学建模。我们将主要的2-5分钟波周期解释为大气过滤的影响；较短的周期因传输到电离层的吸收而过度衰减，而较长的周期在大气中因波的频率低于声波截止而消失的部分被衰减。用波与大气温度结构的共振相互作用解释了在2-5分钟波段内观测到的光谱“精细结构”。要对风暴到电离层传输系数的所有这些细节进行精确的定量建模，需要对声波-重力波动方程进行数值积分，包括地面反射、吸收和大气中的部分反射的影响。
We model mathematically the spectral features of infrasound observed in the ionosphere and believed to be radiated by severe thunderstorms. We explain the dominant 2–5‐min wave period as an effect of atmospheric filtering; shorter periods are excessively attenuated by absorption in transit to the ionosphere, and longer periods are attenuated in portions of the atmosphere where the waves are evanescent because their frequencies are below the acoustic cutoff. An observed spectral ’’fine structure’’ within the 2–5‐min band is explained in terms of resonant interactions between the waves and the atmospheric temperature structure. Accurate quantitative modeling of all these details of the storm‐to‐ionosphere transmission coefficient requires numerical integration of the acoustic‐gravity wave equation, including the effects of ground reflection, absorption, and partial reflections in the atmosphere.Subject Classification: [43]28.30.