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arXiv 1003.4524astro-ph.SR
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太阳活动周期极小期的辐照度变化

Irradiance Variations During This Solar Cycle Minimum

Thomas N. Woods

摘要:

目前的周期最低点似乎比最近的周期最低点更深更广,而且这个最低点似乎与20世纪初的最低点相似。有了来自几个不同卫星仪器的有史以来最好的太阳辐照度测量结果,这一最小值提供了一个独特的机会,以促进我们对太阳辐照度长期变化的理解。将2007-2009年的辐照度结果与1996年前一个最低点期间的辐照度水平进行比较表明,当前最低点的太阳辐照度较低。例如,总太阳辐照度(TSI)表明2008年的辐照度比1996年低约200 ppm,SOHO太阳EUV监测器(SEM)26至34 nm辐照度在2008年比1996年低约15%。然而,这些辐照度变化有30-50%的不确定性,因为这些结果强烈依赖于12年来的仪器退化趋势。低辐照度的支持证据包括太阳磁场较低,并且在电流最小值期间有更多的低纬度冕洞。

英文摘要:

The current cycle minimum appears to be deeper and broader than recent cycle minima, and this minimum appears similar to the minima in the early 1900s. With the best-ever solar irradiance measurements from several different satellite instruments, this minimum offers a unique opportunity to advance our understanding of secular (long-term) changes in the solar irradiance. Comparisons of the 2007-2009 irradiance results to the irradiance levels during the previous minimum in 1996 suggest that the solar irradiance is lower in this current minimum. For example, the total solar irradiance (TSI) indicates lower irradiance in 2008 than in 1996 by about 200 ppm, and the SOHO Solar EUV Monitor (SEM) 26 to 34 nm irradiance is about 15% lower in 2008 than in 1996. However, these irradiance variations have 30-50% uncertainties due to these results depending strongly on instrument degradation trends over 12 years. Supporting evidence for lower irradiance include that the solar magnetic fields are lower and that there are more low-latitude coronal holes during this current minimum.

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