| 中国低纬度地区电离层闪烁效应模式化研究 |
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| 引用本文： | 侍颢,张东和,郝永强,肖佐.中国低纬度地区电离层闪烁效应模式化研究[J].地球物理学报,2014,57(3):691-702. |
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| 作者姓名： | 侍颢 张东和 郝永强 肖佐 |
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| 作者单位： | 北京大学地球物理系, 北京 100871 |
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| 基金项目： | 国家基金委自然科学基金项目(41174134,41274156);国家重点基础研究发展计划(973计划)项目(2011CB811405)联合资助 |
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| 摘 要： | GPS（Global Positioning System）周跳是一种GPS信号异常现象.研究发现一定仰角以上的GPS周跳与电离层闪烁有关，是强电离层闪烁造成的GPS载波信号短时失锁现象，因此其可作为表征电离层闪烁效应的参量.本文通过分析由中国低纬度地区GPS台站原始观测数据提取的GPS周跳发生率与地方时、季节、太阳活动以及磁活动之间的关系，开展电离层闪烁效应与这几种参量之间关系的模式化研究.研究结果表明：（1）周跳发生率存在着地方时分布，发生时段主要在日落19：00LT后到午夜02：00LT之前，发生次数在22：00LT左右达到极大，然后缓慢减少，这一变化特点可以用自变量为地方时的Chapman函数形式来描述；（2）周跳发生率存在年变化特点，主要发生在年积日45~135天（春分季节）和225~315天（秋分季节），可以通过高斯函数来描述每个分季闪烁效应的变化特点；（3）可以利用太阳辐射指数F10.7作为描述周跳随太阳活动周变化的参量，根据周跳随太阳活动周的变化特点，我们使用一个以F10.7为自变量的三次函数来描述这种变化；（4）电离层闪烁与磁活动的关系比较复杂，由于大多数情况下表现为磁活动对电离层闪烁的抑制作用，在本研究中使用一个以地磁活动指数Ap为自变量的的平方根函数来拟合这种变化.
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| 关 键 词： | 电离层闪烁 GPS 周跳 电离层不均匀结构 |
| 收稿时间： | 2013-03-18 |
Modeling study of the effect of ionospheric scintillation at low latitudes in China |
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| SHI Hao,ZHANG Dong-He,HAO Yong-Qiang,XIAO Zuo.Modeling study of the effect of ionospheric scintillation at low latitudes in China[J].Chinese Journal of Geophysics,2014,57(3):691-702. |
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| Authors: | SHI Hao ZHANG Dong-He HAO Yong-Qiang XIAO Zuo |
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| Institution: | Department of Geophysics, Peking University, Beijing 100871, China |
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| Abstract: | GPS (Global Positioning System) CS (Cycle Slip) is a typical anomaly phenomenon for GPS operations that is usually related to severe ionospheric scintillation. Based on the variation of the occurrence of CS at low-latitude stations in China and its connection with local time (LT), season, solar activity and geomagnetic activity, modeling study of the effect of the ionospheric scintillation has been carried out and a preliminary effect model has been developed. On the whole, the CS occurrence increases at about 19:00LT, peaks at about 22:00LT, and then decreases gradually, this local time dependence can be fitted by the Chapman function. CS reaches two maximum periods during one year roughly from DOY (day of year) of 45~135 (near spring equinox) and from DOY of 225~315 (near autumnal equinox), this seasonal dependence can be described by the Gaussian function. Solar radio flux index F10.7 can be used as a parameter to reveal the solar cycle dependence of ionospheric scintillation effect, and the cubic function of F10.7 is proved to be an acceptable option to describe this dependence. The relationship between ionospheric scintillation and geomagnetic activity is more complicated. Because the majority of the magnetic active events show suppression effects on ionospheric scintillation,as a preliminary step, a square root function of Ap is used to model the geomagnetic effect on ionospheric scintillation. |
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| Keywords: | Ionospheric scintillation GPS Cycle Slip Ionospheric irregularity |
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