Global conditions in the solar corona from 2010 to 2017
Global conditions in the solar corona from 2010 to 2017
复制标题
2010年至2017年日冕的全球状况
作者：
H. Morgan;Y. Taroyan
对大量数据的分析揭示了太阳日冕温度和其他性质的全球太阳周期变化。通过减少跨越2010-2017年的巨大数据集，我们比较了上一个活动周期大部分时间内太阳日冕的温度，发射测量（EM）和底层光球磁场的平均全球变化。宁静的日冕平均温度上升从1.4到1.8 MK，而EM增加了近50%的因素，从太阳最低到最高。在太阳活动最大时，一个接近3 MK的高温成分增加，驱动着宁静日冕平均温度的增加，而在整个周期中，等离子体的体积保持在1.6 MK附近。安静的太阳磁场的平均空间平滑幅度从2011年的1.6 G上升到2015年的2.0 G峰值。活动区的条件是高度可变的，但它们的平均值在整个周期内保持大致恒定，尽管在太阳活动最大值的峰值和现在之间，活动区的高温排放（近3 MK）持续减少。活动区的平均温度、电磁场和磁场强度是高度相关的。太阳黑子/活动区面积与平静日冕条件之间的相关性表明，尽管我们发现活动区面积与平静太阳磁场强度之间的变化没有明显的延迟，但衰变太阳黑子在驱动全球变化方面具有重要影响。热日冕对极紫外线（EUV）辐照度的贡献在整个周期的大部分时间里都是由安静的日冕主导的，而高变化性则是由活动区域驱动的。太阳极紫外线辐照度不能仅通过太阳黑子指数准确预测，这突出表明需要继续测量。
Analysis of a huge data set reveals global solar cycle variation of the solar coronal temperature and other properties. Through reduction of a huge data set spanning 2010–2017, we compare mean global changes in temperature, emission measure (EM), and underlying photospheric magnetic field of the solar corona over most of the last activity cycle. The quiet coronal mean temperature rises from 1.4 to 1.8 MK, whereas EM increases by almost a factor of 50% from solar minimum to maximum. An increased high-temperature component near 3 MK at solar maximum drives the increase in quiet coronal mean temperature, whereas the bulk of the plasma remains near 1.6 MK throughout the cycle. The mean, spatially smoothed magnitude of the quiet Sun magnetic field rises from 1.6 G in 2011 to peak at 2.0 G in 2015. Active region conditions are highly variable, but their mean remains approximately constant over the cycle, although there is a consistent decrease in active region high-temperature emission (near 3 MK) between the peak of solar maximum and present. Active region mean temperature, EM, and magnetic field magnitude are highly correlated. Correlation between sunspot/active region area and quiet coronal conditions shows the important influence of decaying sunspots in driving global changes, although we find no appreciable delay between changes in active region area and quiet Sun magnetic field strength. The hot coronal contribution to extreme ultraviolet (EUV) irradiance is dominated by the quiet corona throughout most of the cycle, whereas the high variability is driven by active regions. Solar EUV irradiance cannot be predicted accurately by sunspot index alone, highlighting the need for continued measurements.
影响因子：
5.2
作者：
T. Woollings;M. Lockwood;G. Masato;C. Bell;L. Gray
通讯作者：
T. Woollings;M. Lockwood;G. Masato;C. Bell;L. Gray
影响因子：
6.3
作者：
Ermolli, I.;Matthes, K.;Woods, T. N.
通讯作者：
Woods, T. N.