赤道低纬电离层瑞利-泰勒不稳定性初始扰动波数的临界值

孙志强; 方涵先; 汪四成; 马杰

doi:10.11728/cjss2018.06.871

赤道低纬电离层瑞利-泰勒不稳定性初始扰动波数的临界值

doi: 10.11728/cjss2018.06.871

国防科技大学气象海洋学院南京 211101

基金项目:

国家自然科学基金项目（40505005）和国家重点实验室专项基金项目共同资助

详细信息

作者简介:
孙志强,E-mail:sunzq830259@foxmail.com

通讯作者:
方涵先,E-mail:fanghx@qq.com

中图分类号: P352
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- 被引次数: 0
出版历程
- 收稿日期: 2017-06-05
- 修回日期: 2017-12-20
- 刊出日期: 2018-11-15

Critical Value of Initial Disturbance Wave-number Affecting Rayleigh-Taylor Instability in Equatorial and Low-latitude Ionosphere

Institute of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101

摘要

摘要: 在文献[1]推导的基础上将不稳定判据扩展到±30°磁纬之间的低纬地区.为研究初始扰动波数对等离子体泡的影响，分析了λ_min随初始扰动波数的变化规律，选择二分法计算λ_min=1时的临界波数α_c，并分析α_c随经纬度、太阳活动、季节、地方时以及水平东向电场强度的变化.主要结论如下：α_c随经纬度、季节、太阳活动以及地方时的变化规律和等离子体泡及闪烁活动的规律基本一致，α_c越小，等离子体泡越容易产生；水平东向电场增强有利于等离子体泡形成.α_c的值对人工影响电离层时选择最优扰动条件具有一定的指导意义.
- 初始扰动波数 /
- R-T不稳定性 /
- 等离子体泡发生率
Abstract: The sufficient condition of Rayleigh-Taylor instability in equatorial ionosphere has been derived by Ref.[1]. In this paper, the sufficient condition is expanded to low-latitude areas of ±30° magnetic latitude. To study how the initial disturbance wave-number affects the generation of plasma bubble, the variations of λ_min as initial disturbance wave-number are analysed. According to the dichotomy method, the critical wave-number α_c is attained for λ_min=1. Moreover, the characteristics of α_c with geomagnetic latitudes, longitudes, seasons, solar activities, local times and the horizontal eastern electric filed are analyzed. The main conclusions are as follows. The variations of α_c with latitudes, longitudes, seasons, solar activities, and local times are consistent with plasma bubbles and scintillations. The shorter the wave-length is, the easier it would be to generate the Plasma Bubbles (PB). The enhancements of the horizontal eastward electric filed are helpful to initiate PBs. The value of α_c is benificial to decide the best disturbed way in the ionospheric artificial modification.
- Initial disturbance wave-number /
- Rayleigh-Taylor instability /
- Occurrence rate of plasma bubbles

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参考文献(21)

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