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2009年7月22日日食期间,分别在重庆、桂林和青岛利用阿尔法场强与相位监测仪观测了来自俄罗斯阿尔法导航系统位于Novosibirsk、Krasnodar和Khabarovsk的3个发射台3个频率的甚低频信号,并对实验数据进行了分析。通过建立日食期间的电离层模型,结合实际传播路径地面电磁参数,推测全食区低电离层的等效高度;给出经不同路径传播的VLF(甚低频)信号相位突变与日食发生时刻的关系及原因;分析了日食期间经不同路径传播的VLF信号的场强起伏变化,发现场强变化滞后于相位变化这一现象。
Abstract：The phase and field strength of VLF signals at three frequencies,which were transmitted from Novosibirsk,Krasnodar and Khabarovs stations of the Russian alpha hyperbolic navigational system,were measured with the alpha phase/field-strength monitor in Chongqing,Guilin and Qingdao respectively during a solar eclipse of July 22,2009,and the measurements were analyzed.The ionospheric equivalent height in the total eclipse regions was derived by establishing the ionospheric model and considering the electromagnetic parameters for the propagation path.The relation between the sudden change in phase of VLF signal and the time when the solar eclipse took place were obtained for different propagation paths,and the cause of the relation were analyzed.Besides,the amplitude changes occurred during the solar eclipse for different propagation paths were analyzed and it was found that the phase change occurred earlier than the amplitude change.
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基本信息:
DOI：10.13875/j.issn.1674-0637.2011.01.010
中图分类号:P125.11
引用信息:
[1]张世田,陈林如,王元新.2009年7月22日日食期间VLF信号相位和场强的观测和分析[J].时间频率学报,2011,34(01):66-76.DOI:10.13875/j.issn.1674-0637.2011.01.010.
基金信息:
国家重点实验室基金资助项目(9140C080405100C08)