| 利用COSMIC掩星探测分析120°E经线附近电离层E层闪烁指数变化 |
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| 引用本文： | 黄智.利用COSMIC掩星探测分析120°E经线附近电离层E层闪烁指数变化[J].地球物理学报,2017,60(2):480-488. |
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| 作者姓名： | 黄智 |
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| 作者单位： | 江苏师范大学物理与电子工程学院, 徐州 221116 |
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| 基金项目： | 国家自然科学基金（41104096）资助. |
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| 摘 要： | 利用气象、电离层和气候卫.星联合观测系统COSMIC掩星2007-2013年探测资料,分析了120°E经线附近电离层E层区域(70~140km)闪烁指数的季节、地方时和空间变化.结果表明强电离层闪烁主要集中在磁纬度±30°内,夏季达到最大,冬季其次,春季最小.闪烁峰值大小与太阳辐射有关,但北半球夏冬季闪烁峰值大于南半球观测结果,秋半球闪烁峰值大于春半球观测结果.地磁高纬地区较强闪烁现象出现在地方时傍晚之后,午夜前后达到最大值.地磁中纬和低纬区域日出后即出现较为明显的闪烁现象,一直持续至夜间甚至凌晨,分别约在中午和傍晚前达到最大值.磁赤道区闪烁现象通常始于地方时日出后,最大值发生在傍晚1800LT左右.电离层E区的闪烁峰值大都集中110km高度,但高纬地区的峰值高度略有降低.此外,太阳和地磁活动的增强一定程度上会抑制E层闪烁现象.相关研究结果有利于分析E层不规则结构及物理形成机制,同时为电离层区域闪烁模型的建立提供有用的信息.
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| 关 键 词： | COSMIC 电离层 闪烁指数 峰值高度 偶发E层 |
| 收稿时间： | 2016-05-12 |
Characterization of ionospheric E-layer scintillation index along the longitude 120°E using COSMIC during 2007-2013 |
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| HUANG Zhi.Characterization of ionospheric E-layer scintillation index along the longitude 120°E using COSMIC during 2007-2013[J].Chinese Journal of Geophysics,2017,60(2):480-488. |
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| Authors: | HUANG Zhi |
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| Institution: | School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China |
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| Abstract: | The seasonal, temporal and spatial variations of the scintillation index along the longitude 120°E at the E regional altitude (70~140 km) are analyzed using the GPS radio occultation measurements from the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) during 2007-2013. The results show that the intense scintillation within ±30° magnetic latitude has the greatest value in summer, followed by winter, autumn and spring. The strong scintillation peak is in close connection with solar radiation intensity and sunshine duration. However, the scintillation index in the northern hemisphere is greater than in the southern hemisphere in summer/winter and that in the autumn hemisphere is slightly greater than in the spring hemisphere. The large S4max index at high latitudes is found to start at post-sunset (1800 LT), often persists till pre-sunrise and reaches maximum values at around midnight. However, the S4max index at the middle/low latitudes can be observed to start at around post-sunrise, persists till midnight or even dawn, and reaches its peak before afternoon/dusk. The S4max index in the equatorial regions can be observed to start at the post-sunrise and end before midnight, and reaches its peak at appoximate 1800 LT. The scintillation peaks in the middle and low latitudes often occur at an altitude of appoximate 110 km and yet the peaks in the high latitudes are below an altitude of 110 km. It is also found that enhanced solar or geomagnetic activities can suppress the ionospheric E-layer scintillation. The results can be useful for studying the ionospheric irregularities at the E region altitude, and provide valuable information for constructing a regional scintillation model. |
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| Keywords: | COSMIC Ionosphere Scintillation index Peak altitude Sporadic E-layer |
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