| Puerto Rico地区偶发E层临界频率特性统计分析 |
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| 引用本文： | 王栖溪,方涵先,牛俊,汪四成.Puerto Rico地区偶发E层临界频率特性统计分析[J].空间科学学报,2016,36(1):18-24. |
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| 作者姓名： | 王栖溪 方涵先 牛俊 汪四成 |
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| 作者单位： | 解放军理工大学气象海洋学院 南京 211101 |
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| 基金项目： | 国家自然科学基金项目 资助(40505005) |
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| 摘 要： | 利用Puerto Rico站(18.5°N, 67.2°W) 1997—2013 年的Es临界频率数据, 对该地区Es特性进行了分析. 结果表明: 临界频率 f0Es 日均值具有一定的16天周期性变化特征, 其可能是大气行星 波引起的; f0Es 随地方时的变化基本上呈一个波峰波谷结构, 波谷 位于06:00LT左右, 波峰位于14:00LT左右, 同时存在午夜和日落后异常高 值现象, 其分别与午夜南向风场减弱和夜间电场变化有关; 通过分析不同强 度Es, 发现潮汐风造成较低强度Es发生率的地方时分布与中等和高强度Es 明 显不同. 这些现象的相关物理机制尚需进一步研究论证.
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| 关 键 词： | 偶发E层 f0Es Es发生率 |
| 收稿时间： | 2015-04-03 |
Statistics on the Critical Frequency of Ionospheric Sporadic E Layer Observed at Puerto Rico Region |
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| Affiliation: | Institution of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101 |
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| Abstract: | The Es property in Puerto Rico region (18.5°N, 67.2°W) has been investigated using the Es critical frequency during 1997—2013. Results show that the diurnal average critical frequency presents a weak 16-day period which may be caused by the planetary wave. The critical frequency variation with local time has also been investigated which presents a valley (at about 06:00LT) and a peak (at about 14:00LT) structure. Two anomalous peaks exist after the midnight and sunset, respectively. The phenomenon is considered as a result of downward electron flux caused by the diedown of southward wind field and variability of electric field during the nighttime. It has also been found that the incidence of Es with lower strength is clearly different from those with medium and higher strength, and it can be attributed to the tidal wind. These physical mechanisms need to be proved by both observations and further mechanical investigation. |
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