Backscatter measurements of 11-cm equatorial spread-F irregularities
Backscatter measurements of 11-cm equatorial spread-F irregularities
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11 厘米赤道传播-F 不规则性的后向散射测量
DOI：
10.1029/gl007i010p00848
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发表时间：
1980
影响因子：
5.2
通讯作者：
R. Tsunoda
中科院分区：
文献类型：
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作者：
R. Tsunoda
在赤道F区电离层中，已发现存在湍流级联过程，该过程从长达数十公里的不规则空间波长延伸至短至36厘米的波长。为了研究小于 36 cm 波长的小范围范围，使用 1320 MHz 的频率（对应于 11 cm 的不规则波长）进行了赤道雷达实验。描述了对 11 厘米场对准不规则物 (FAI) 的雷达反向散射的首次观测。这些测量将 F 区 FAI 的空间波长范围扩展到接近电子回转半径和德拜长度的长度。这些结果与高频漂移波理论的一致性表明这些观测结果可能是赤道电离层所独有的。也就是说，该理论所称的低电子密度要求可能会排除 F 区电离层其他地方（赤道等离子体气泡除外）中 11 厘米 FAI 的存在。
In the equatorial F-region ionosphere, a turbulent cascade process has been found to exist that extends from irregularity spatial wavelengths longer than tens of kilometers down to wavelengths as short as 36 cm. To investigate the small-scale regime of wavelengths less than 36 cm, an equatorial radar experiment was conducted using a frequency of 1320 MHz that corresponds to an irregularity wavelength of 11 cm. The first observations of radar backscatter from 11-cm field-aligned irregularities (FAI) are described. These measurements extend the spatial wavelength regime of F-region FAI to lengths that approach both electron gyroradius and the Debye length. Agreement of these results with the theory of high-frequency drift waves suggests that these observations may be unique to the equatorial ionosphere. That is, the requirement of low electron densities for which the theroy calls may preclude the existence of 11-cm FAI elsewhere in the F-region ionosphere, except in equatorial plasma bubbles.