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空间科学学报 ›› 2015, Vol. 35 ›› Issue (4): 438-444.doi: 10.11728/cjss2015.04.438

• 日球层物理和太阳系探测 • 上一篇    下一篇

非相干雷达探测低电离层的结果分析

马欣1,2, 陈罡1,2, 钟鼎坤1,2, 赵正予1   

  1. 1. 武汉大学电子信息学院 武汉 430072;
    2. 中国科学院空间科学与应用研究中心 空间天气学国家重点实验室北京 100190
  • 收稿日期:2014-01-14 修回日期:2015-03-05 出版日期:2015-06-15 发布日期:2015-06-30
  • 基金资助:

    国家自然科学基金项目(41474132), 国家重点实验室专项基金项目和长江科学院开放研究基金项目共同资助(CKWV2013224/KY)

Analysis and Results from ISR Observations of Lower Ionosphere

MA Xin1,2, CHEN Gang1,2, ZHONG Dingkun1,2, ZHAO Zhengyu1   

  1. 1. School of Electronic Information, Wuhan University, Wuhan 430072;
    2. State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190
  • Received:2014-01-14 Revised:2015-03-05 Online:2015-06-15 Published:2015-06-30

摘要:

位于波多黎各的Arecibo非相干雷达可以获得低电离层电子和离子密度, 利用此非相干雷达数据对中纬度低电离层的运动特征进行研究. 得到了电子密度随时间和高度的变化 情况, 结果显著呈现出周日变化特征, 并分析了电子密度随高度的变化规律. 进一步对数据进行频谱分析, 深入研究低电离层电子密度的周日变化效应. 得到电子密度的高度剖面, 发现从F层底部到E层有明显的等离子体沉降. 低电离层的层结构特征及电子密度变化表明, 在该区域还存在不同程度的等离子体扰动, 由此对低电离层的作用因素 进行分析, 认为大气潮汐或声重波可能对低电离层产生扰动, 即低电离层与大气存在一定程度的耦合作用.

关键词: 低电离层, 非相干雷达, 等离子体, 潮汐, 声重波

Abstract:

The D and E regions lie in the lower ionosphere region of 60~110km height. This region is influenced by solar radiation, cosmic noise radiation, atmospheric electrodynamics and many factors, and there exists a variety of incredible variation characteristics. Even in the magnetically quiet day, atmospheric electrodynamics can make a significant effect on this region except solar radiation. In the D region, there exists radio waves strong absorption, which can influence the transmission of high frequency radio waves. Electron and ion density can be obtained from the Incoherent Scatter Radar (ISR) Arecibo, located at Puerto Rico. ISR data can be used to study the movement characteristics of the lower ionosphere in mid-latitude, and get the electron density curves changing with time and height, which present obvious diurnal changing phenomenon. The spectrum of the data is analyzed to probe diurnal effects of electron density changes. Besides the electron density height profiles have been drawn, and observe obvious plasma descending from the base of F-layer to E region. The layer structure characteristics of the lower ionosphere and electron density changing show that there exists different degree of disturbance. By analyzing the influencing factors it is concluded that the atmospheric tides and the acoustic gravity waves can cause disturbance to lower ionosphere, which is coupled with the atmosphere in certain degree.

Key words: Lower ionosphere, Incoherent Scatter Radar (ISR), Plasma, Tides, Acoustic gravity waves

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