论文标题
阳光般的星星在太阳气候强迫上露出光明
Sun-like Stars Shed Light on Solar Climate Forcing
论文作者
论文摘要
最近出版的，在1993年至2017年之间在Fairborn天文台获得的72个阳光恒星的精确恒星光度法用于对1750年以来的太阳能强迫地球大气的强迫设置$ \ pm $ \ pm $ 4.5 w m $^{ - 2} $，这是1750年以来的。做出了三个关键的假设。在降低的重要性顺序中，它们是：（a）大多数亮度变化发生在$ \ $ \ $ 17年的平均时间序列长度内； （b）从黄道中看到的太阳作为中年太阳能恒星的合奏； （c）Strömgren$ b $和$ y $ bands中的窄带光度法与太阳辐照度成正比。假设（a）可以通过获得类似太阳样恒星的更多光度数据，尤其是已经观察到的那些光度法，可以进行假设（a）。从1999年开始观察到八颗具有近极参数的恒星，自1993年以来有两颗。我们的工作揭示了继续和扩展地面光度法的重要性，以补充来自空间的昂贵太阳辐照度测量。
Recently published, precise stellar photometry of 72 Sun-like stars obtained at the Fairborn Observatory between 1993 and 2017 is used to set limits on the solar forcing of Earth's atmosphere of $\pm$ 4.5 W m$^{-2}$ since 1750. This compares with the +2.2 $\pm$ 1.1 W m$^{-2}$ IPCC estimate for anthropogenic forcing. Three critical assumptions are made. In decreasing order of importance they are: (a) most of the brightness variations occur within the average time-series length of $\approx$17 years; (b) the Sun seen from the ecliptic behaves as an ensemble of middle-aged solar-like stars; and (c) narrow-band photometry in the Strömgren $b$ and $y$ bands are linearly proportional to the total solar irradiance. Assumption (a) can best be relaxed and tested by obtaining more photometric data of Sun-like stars, especially those already observed. Eight stars with near-solar parameters have been observed from 1999, and two since 1993. Our work reveals the importance of continuing and expanding ground-based photometry, to complement expensive solar irradiance measurements from space.
