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arXiv 0907.1500astro-ph.SRastro-ph.EP
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1974年以来太阳UV辐照度的重建

Reconstruction of solar UV irradiance since 1974

N. A. Krivova, S. K. Solanki, T. Wenzler, B. Podlipnik

摘要:

太阳紫外线辐照度的变化是地球高层大气化学和物理过程的重要驱动因素,也可能影响全球气候。在这里,我们重建太阳紫外线辐照度在115-400 nm的范围内,在1974-2007年期间,利用最近开发的经验扩展的SATIRE模型采用SUSIM数据。太阳光球磁通量的演变,这是一个中心输入到模型中,描述的磁图和连续图像记录在基特峰国家太阳天文台1974年和2003年之间,并由MDI仪器对SOHO自1996年以来。重建将现有的观测记录延长了1.5个太阳周期。重建的Ly-alpha辐照度与Woods等人(2000年)的复合时间序列一致。辐照度变化的幅度随着波长的减小而增大,在对研究地球气候特别感兴趣的波长区域(Ly-alpha和氧气吸收连续谱和130至350纳米之间的波段),辐照度变化的幅度比可见光强一到两个数量级,或者如果对所有波长进行积分(太阳总辐照度)。

英文摘要:

Variations of the solar UV irradiance are an important driver of chemical and physical processes in the Earth's upper atmosphere and may also influence global climate. Here we reconstruct solar UV irradiance in the range 115-400 nm over the period 1974-2007 by making use of the recently developed empirical extension of the SATIRE models employing SUSIM data. The evolution of the solar photospheric magnetic flux, which is a central input to the model, is described by the magnetograms and continuum images recorded at the Kitt Peak National Solar Observatory between 1974 and 2003 and by the MDI instrument on SoHO since 1996. The reconstruction extends the available observational record by 1.5 solar cycles. The reconstructed Ly-alpha irradiance agrees well with the composite time series by Woods et al (2000). The amplitude of the irradiance variations grows with decreasing wavelength and in the wavelength regions of special interest for studies of the Earth's climate (Ly-alpha and oxygen absorption continuum and bands between 130 and 350 nm) is one to two orders of magnitude stronger than in the visible or if integrated over all wavelengths (total solar irradiance).

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