朱正平,陈郑洲,罗伟华.海南地区扩展F统计特性及行星波扰动观测[J].中南民族大学学报自然科学版,2017,(2):97-103
海南地区扩展F统计特性及行星波扰动观测
Statistical Characteristics of Spread-F and Observations of Planetary Wave Disturbances in Hainan
  
DOI:
中文关键词: 扩展F  季节变化  日落后反转增强  行星波扰动  发电机电场
英文关键词: spread-F  seasonal variations  PRE  planetary wave disturbances  dynamo electrical field
基金项目:国家自然科学基金资助项目(41474135,41474134)
作者单位
朱正平,陈郑洲,罗伟华 中南民族大学 电子信息工程学院武汉 430074 
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中文摘要:
      为研究中国低纬地区扩展 F(SF)的发生时间和季节特性以及行星波扰动对其影响,利用2013年海南三亚综合观测站 DPS-4D 数字测高仪观测到的电离层频高图数据,统计分析了扩展 F 的开始和持续时间及其季节变化;提取了电离层虚高,从虚高的逐日变化中获取了F层上抬时间和行星波扰动特征,并对上抬期间电离层 F 层最小虚高(h'F)、临界频率(foF2)等参数进行了小波分析.结果表明: 海南地区扩展 F 类型主要为RSF, 其季节性最大值(51%)出现在分点季,RSF在日落后和午夜后均有发生,而 FSF 主要在夏季午夜后出现; 海南地区电离层虚高在日落后反转增强(PRE) 期间有明显上抬现象,电离层特征参数中存在周期为准 2d、5d 以及 10d 的行星波扰动, 它通过调制电离层F区发电机电场的方式激励扩展 F的发生和发展.
英文摘要:
      In this paper, the ionograms recorded by the DPS-4D digisonde at Sanya ionospheric observatory station in 2013 are used to study the onsets, durations and seasonal variations of the spread-F (SF) . The uplift time of F-region and the planetary wave disturbances are obtained from the daily virtual height variations extracted from the ionograms. The minimum virtual height (h'F) and the critical frequency of F layer (foF2) ,etc. are analyzed with wavelets transform during uplift.The results show: The RSF is the main type with a seasonal maximum value about 51% in equinox in Hainan.RSF occur from post-sunset to post-midnight, while FSF mainly appear at post-midnight during summer months. There are obvious elevations of virtual height during pre-reversal enhancement (PRE) . There are planetary wave disturbances with quasi 2-day, 5-day and 10-day periods of the ionospheric characteristic parameters and they drive the initiation and the development of SF by modulating dynamo electrical field in the ionospheric F-region.
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