This study focuses on high-energy proxies of stellar magnetic activity over long-term starspot cycles of three low-activity Sun-like stars: α Centauri A (HD 128620: G2 V), α Cen B (HD 128621: K1 V), and the Sun itself. Data sets include: daily solar ultraviolet irradiance spectra and X-ray fluxes from the Solar Radiation and Climate Experiment, during recent sunspot Cycles 23 and 24; Interface Region Imaging Spectrograph long-slit stigmatic imaging of solar Mg ii h (2803 Å) and k (2796 Å) in quiet and active regions; and Hubble Space Telescope Imaging Spectrograph ultraviolet, and Chandra X-ray, campaigns on α Cen AB. Established stellar “flux–flux” relations, for example X-rays ( T ∼ 1 MK) versus Mg ii ( T ∼ 8000 K), showed increasing power-law slopes with increasing formation temperature, but these give way on the Sun to bent power laws, and surprising inversions in the activity hierarchy: Si

中文翻译：

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在太阳-星际联系的战ren中。I.紫外线和X射线通量的相关性贯穿太阳和半人马座AB的活动周期

这项研究的重点是三个低太阳活动恒星的长期星点周期上恒星磁活动的高能代理：αCentauri A（HD 128620：G2 V），αCen B（HD 128621：K1 V），和太阳本身。数据集包括：在最近的太阳黑子周期23和24期间，日太阳紫外线辐射光谱和来自太阳辐射与气候实验的X射线通量；界面区域成像光谱仪在安静和活跃区域对Mg ii h（2803Å）和k（2796Å）的太阳进行长缝像散成像；和哈勃太空望远镜成像光谱仪用紫外线和钱德拉X射线在αCen AB上运动。已建立的恒星“通量-通量”关系，例如X射线（T〜1 MK）与Mg ii（T〜8000 K），显示出随幂曲率斜率随地层温度升高而增加，但在太阳弯折时会被屈服幂律，