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首页> 外文会议>General Assembly and Scientific Symposium of the International Union of Radio Science >Response of the mesosphere and lower ionosphere to the Extremely Severe Cyclone ‘Fani’ of 2019 over the North Indian Ocean
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Response of the mesosphere and lower ionosphere to the Extremely Severe Cyclone ‘Fani’ of 2019 over the North Indian Ocean

机译：中印度洋和低层电离层对北印度洋上2019年极度强气旋“ Fani”的响应

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摘要

We present new observations of lower ionospheric disturbances due to the extremely severe cyclonic storm ‘Fani’ over northeastern part of the Indian Ocean. Very Low Frequency radio signals received from two places Kolkata and Cooch Behar, India revealed disturbances in the lower ionosphere namely in the D-region ionosphere. Mesospheric temperature and Ozone concentration data from the NASA’s TIMED satellite were also used to diagnose the disturbances in the lower ionosphere. Significant wavelike oscillations and strong amplitude anomalies in daytime and nighttime VLF signal were observed during the intense phase of the cyclone. Both the mesospheric Ozone concentration and temperature showed maximum anomalies beyond $3 sigma$ during the cyclone period. Mesospheric temperature enhancement around VLF reflection heights indicates changes in the chemical composition and electron-neutral balance in the D-region ionosphere. Wavelet analysis of the VLF amplitudes indicates a strong anti-correlation of the total wavelet power in the wave-band of periods 10-30 min with the cyclone pressure which suggests a possibility of monitoring cyclone intensity from mesospheric gravity waves using VLF radio measurements.
机译：我们提出了有关印度洋东北部极端严重的“ Fani”气旋风暴“ Fani”引起的电离层扰动降低的新观察结果。从印度加尔各答和库克比哈尔（Cooch Behar）两个地方接收到的极低频无线电信号揭示了下部电离层即D区电离层的扰动。来自NASA的TIMED卫星的中层温度和臭氧浓度数据也被用于诊断低层电离层的干扰。在强旋风期间，白天和夜间的VLF信号出现了明显的波状振荡和强烈的振幅异常。在旋风期间，中层臭氧浓度和温度均显示出最大异常，超过$ 3 \ sigma $。 VLF反射高度附近的中层温度升高表明，D区电离层的化学成分和电子中性平衡发生了变化。对VLF振幅的小波分析表明，周期为10-30分钟的波段中的总小波功率与旋风器压力有很强的反相关性，这表明有可能使用VLF无线电测量方法从中层重力波中监测旋风器强度。

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