| 低纬哨声的路径纬度和临界截止纬度 |
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| 引用本文： | 王友善.低纬哨声的路径纬度和临界截止纬度[J].地球物理学报,1986,29(4):319-328. |
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| 作者姓名： | 王友善 |
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| 作者单位： | 中国科学技术大学, 合肥 |
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| 摘 要： | 本文采用国际地磁参考场（1980 IGRF,n=8）低纬磁力线经验公式和模式电离层,结合海南岛三亚（18.24°N,109.5°E;磁纬7.04°N）观测到的哨声资料,对磁纬10°N以下哨声的路径纬度和临界截止纬度进行了分析和讨论.
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| 关 键 词： | 纬度 电离层电子浓度 IGRF 磁纬 低纬哨声 国际地磁参考场 混合路径 经验公式 地磁场 地磁坐标 |
| 收稿时间： | 1984-12-25 |
PATH LATITUDE AND CRITICAL LOW-LATITUDE CUT-OFF FOR LOW-LATITUDE WHISTLERS |
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| WANG YOU-SHAN.PATH LATITUDE AND CRITICAL LOW-LATITUDE CUT-OFF FOR LOW-LATITUDE WHISTLERS[J].Chinese Journal of Geophysics,1986,29(4):319-328. |
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| Authors: | WANG YOU-SHAN |
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| Institution: | University of Science and Technology of China, Hefei |
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| Abstract: | The path latitude and critical low-latitude cut-off for low-latitude whistlers ob-served on the ground （in magnetic latitude ≤10°N） are studied in terms of the 1980 IGEF （n=8） and the model ionosphere. An empirical formula for magnetic field linesof IGRF and an analytic expression of the equivalent path length of whistler propaga-tion are presented. On the basis of this, an analysis of the data of whistlers observedat Sanya （18.24°N, 109.5°E; magnetic latitude 7.04°N） in Hainan of China is made. Themajor results are as follows: （1） Of the whistlers observed at Sanya, there are at least78% coming from the south of zenith of Sanya, whereas 86-96% of the ducted whist-lers with low cut-off frequency ≤ 1.3 kHz have their path latitude in between 7.5°-9.4°N （IGRF）. （2） The critical low-latitude cut-off for whistlers must be less than7.0°N （IGRF）, but greater than or equal to 5.04°N （IGRF）. At geographic longitude109.5°E in the northern hemisphere, the values of 7.0° （IGRF） and 5.04° （IGRF） areequivalent to magnetic latitude 4.4°N and 2..44°N iin terms of the above altitude respec-tively. |
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