基于小波变换和经验模式分解的太阳辐照的统计分析
文献类型：学位论文
| 作者 | 徐景晨
|
| 学位类别 | 硕士 |
| 答辩日期 | 2011-06-01 |
| 授予单位 | 中国科学院研究生院（云南天文台） |
| 授予地点 | 北京 |
| 导师 | 李可军 |
| 关键词 | 太阳物理学 太阳活动 太阳辐照 小波分析 EMD变换 |
| 其他题名 | A Statistical Study of Solar Irradiance Based on Wavelet Transform and Empirical Mode Decomposition |
| 学位专业 | 天体物理 |
| 中文摘要 | 太阳总辐照是指在地球大气层顶接收到的太阳总辐射照度，也叫“太阳常数”，但它实际上并非常数；太阳总辐照随波长的分布即为太阳分光辐照。太阳辐照是地球气候系统的能量来源，是引起地球气候长期变化的关键因素之一。地球大气、云层、地面等对太阳辐照的吸收、散射、反射强烈依赖于波长，因此太阳辐照在很大程度上决定了地球大气的温度结构和化学组成。太阳辐照不同波段的能量产生于不同高度的太阳大气，太阳分光辐照的变化反应了太阳不同大气层的活动情况。 研究太阳辐照，对理解太阳表面及内部活动的物理过程，研究日地关系、地球大气、气候科学、以及解决人类面临的全球气候变暖的挑战等都有重要意义。 首先简单介绍了太阳辐照，第二章介绍了1978年以来太阳辐照的空间观测，观测数据的并合和仍然存在的一些问题，并讨论了太阳辐照变化的原因。第三章介绍了太阳辐照的重构，包括由代理物指数重构、由辐射强度图重构、由太阳表面磁场测量重构，以及三种重构方法的比较；还介绍了太阳辐照的长期重构及其在气候问题中的一些应用。第四章介绍了利用小波分析和经验模式分解方法对太阳总辐照PMOD合成数据进行的一些研究。 |
| 英文摘要 | Total solar irradiance (TSI), the so-called Solar Constant, is the total amount of electromagnetic energy irradiated from the Sun over the entire spectrum observed at the top of the Earth's atmosphere per unit area and per unit time. The spectrally distributed total solar irradiance is the Spectral Solar Irradiance (SSI). Solar irradiance is the driving term in the Earth's energy budget, and its variations are reckoned to be the prime solar factors exerting influence on the Earth's long-term climate change. The absorbtion, scattering, reflection of the solar energy by the Earth's atmosphere, clouds, or surface depend greatly on wavelength. Irradiance of different wavelength comes from different regions of the sun's atmosphere, thus the variations of SSI give us much infomation about solar activities at different heights of the solar atmosphere. The study of the variations of solar irradiance has important implications for our understanding of solar internal structure, solar activities, solar-terrestrial relationship, earth's atmosphere, as well as the global changes in the Earth's climate system. In Sect. 2 the measurements of both total and spectral solar irradiance are reviewed, and problems which still exist in the three composite data are discussed. Sect. 3 describes the reconstruction of solar irradiance by three different methods, including reconstruction from proxy indices, from intensity images, and from the measurements of surface magnetic field. The differences between different methods are also indicated. The progress of long-term reconstruction of solar irradiance and its application to climate research is reviewed. Utilizing the powerful methods, wavelet analysis and empirical mode decomposition, we studyed the PMOD composite of daily TSI, and the results are described in Sect. 4. |
| 学科主题 | 天文学 |
| 语种 | 中文 |
| 公开日期 | 2016-05-03 |
| 页码 | 51 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/6614]  |
| 专题 | 云南天文台_太阳物理研究组 |
| 推荐引用方式 GB/T 7714 | 徐景晨. 基于小波变换和经验模式分解的太阳辐照的统计分析[D]. 北京. 中国科学院研究生院（云南天文台）. 2011. |
入库方式： OAI收割
来源：云南天文台
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