太阳活动与晴空地面辐射的关系
On the Relation between Solar Activity and Clear-Sky Terrestrial Irradiance
摘要：
对莫纳罗亚山天文台1958-2010年的直射光束太阳辐照度测量记录进行了分析，以研究在四个以上的太阳活动周期内晴空陆地日射量随太阳活动的变化。原始辐照度数据表现出显着的季节性周期，由于火山气溶胶的排放量较低的辐照度的延长期，以及独立于太阳活动的大气传输的长期减少。在对这些影响进行校正后，我们发现，在整个太阳活动周期中，晴朗天空的地面辐照度通常会变化约0.2 +/- 0.1%，这与大气层上方的总太阳辐照度的变化具有相同的数量级。对晴空大气传输变化的调查未能发现太阳黑子数量的显著趋势。因此，没有证据表明有一种未知的效应会随着太阳活动而放大晴空辐照度的变化。
英文摘要：
The Mauna Loa Observatory record of direct-beam solar irradiance measurements for the years 1958-2010 is analysed to investigate the variation of clear-sky terrestrial insolation with solar activity over more than four solar cycles. The raw irradiance data exhibit a marked seasonal cycle, extended periods of lower irradiance due to emissions of volcanic aerosols, and a long-term decrease in atmospheric transmission independent of solar activity. After correcting for these effects, it is found that clear-sky terrestrial irradiance typically varies by about 0.2 +/- 0.1% over the course of the solar cycle, a change of the same order of magnitude as the variations of the total solar irradiance above the atmosphere. An investigation of changes in the clear-sky atmospheric transmission fails to find a significant trend with sunspot number. Hence there is no evidence for a yet unknown effect amplifying variations of clear-sky irradiance with solar activity.
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