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对El Campo太阳雷达实验数据的周期性分析
Alternative TitleThe periodogram analysis of El Campo Solar Radar observation data
叶林
Subtype硕士
Thesis Advisor林隽
2015-07-01
Degree Grantor中国科学院研究生院
Place of Conferral北京
Degree Discipline天体物理
Keyword太阳雷达 Lomb-scargle算法 日冕物质抛射 地磁暴 Dst 指数
Abstract太阳雷达是利用雷达发射器主动向太阳发射特定波段的电磁波,并接收反 射回波的雷达设备。通过研究回波的性质,了解太阳大气磁场结构、运动状 况以及其他方面的重要信息。El Campo 太阳雷达在长达8 年的时间内对日冕 进行了观测,跟踪了太阳活动的变化。我们运用Lomb–Scargle 算法对其所获 得的数据进行了周期性分析,发现其所测太阳的雷达散射截面数据的变化存 在200 天和540 天周期变化。我们对这两个周期进行了讨论。并选取了较大 的散射截面(≥20 σ⊙)与Dst 指数进行了对比分析。最后对El Campo 太阳雷 达实验进行了总结,并展望了太阳雷达未来的发展。
Other AbstractSolar Radar can transmit radar waves to the Sun actively. By analyzing the echoes, we can obtain motions, magnetic field, and other information of solar atmosphere. The El Campo solar radar has done regular observations on solar corona for 8 years from 1961 to 1969,which tracked solar activities during a long time. We analyzed El Campo data with Lomb–Scargle periodogram algorithm and found that solar radar cross sections variations of 200 days and 540 days period. Compared radar cross sections and the Dst indexes, we found that there was no significant relationship between them. Then, the proposal of solar radar for future was made.
Subject Area天文学
Language中文
Document Type学位论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9465
Collection太阳物理研究组
Affiliation中国科学院云南天文台
Recommended Citation
GB/T 7714
叶林. 对El Campo太阳雷达实验数据的周期性分析[D]. 北京. 中国科学院研究生院,2015.
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