论文标题
静态时期的活动区域辐照度：Sun-As-A-Star Spectra的新见解
Active Region Irradiance During Quiescent Periods: New Insights from Sun-as-a-star Spectra
论文作者
论文摘要
在静止期间，太阳活性区域（ARS）通常辐射多少能量？这是燃料和ARS的存储和释放模型的基本问题，但目前观察结果却很差。在这里，我们使用太阳能动力学天文台（SDO）上EUV变异性实验（EVE）的“ Sun-As-A-A-A-A-A-A-A-A-A-A-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a-a as source源”光谱进行了新的估计值，以提供对不断发展的活性区域的辐射能量损失的新估计。尽管EVE提供了出色的光谱（5-105nm）和温度（2-25MK）进行AR分析，但据我们所知，由于缺乏空间分辨率和源混淆的可能性，这些数据尚未用于此目的。在这里，我们提出了解决这个问题的方法。我们分析了EVE数据时间序列，当磁盘上只有一个大AR 11520时。通过减去安静的太阳背景，我们估计仅AR中的EUV辐射贡献。我们估计1-300A和天文标准ROSAT-PSPC，3-124A，PASSBANDS中的平均AR辐照度和累积AR辐射能损耗，并将其与通过Photosphere和太阳能循环光度的变化进行比较。我们发现，尽管AR辐射能损耗比光球时的典型磁能喷射速率小约100倍，但它们是与大耀斑相关的降压器辐射能的大数量级或类似的阶。这项研究是使用EVE Sun-As-A-Star观测值对AR热性质进行的首次详细分析，并为其他恒星的AR研究打开了大门。
How much energy do solar active regions (ARs) typically radiate during quiescent periods? This is a fundamental question for storage and release models of flares and ARs, yet it is presently poorly answered by observations. Here we use the "Sun-as-a-point-source" spectra from the EUV Variability Experiment (EVE) on the Solar Dynamics Observatory (SDO) to provide a novel estimate of radiative energy losses of an evolving active region. Although EVE provides excellent spectral (5-105nm) and temperature (2-25MK) coverage for AR analysis, to our knowledge, these data have not been used for this purpose due to the lack of spatial resolution and the likelihood of source confusion. Here we present a way around this problem. We analyze EVE data time series, when only one large AR 11520 was present on the disk. By subtracting the quiet Sun background, we estimate the radiative contribution in EUV from the AR alone. We estimate the mean AR irradiance and cumulative AR radiative energy losses in the 1-300A and astronomical standard ROSAT-PSPC, 3-124A, passbands and compare these to the magnetic energy injection rate through the photosphere, and to variations of the solar cycle luminosity. We find that while AR radiative energy losses are ~100 times smaller than typical magnetic energy injection rates at the photosphere, they are an order of magnitude larger or similar to the bolometric radiated energies associated with large flares. This study is the first detailed analysis of AR thermal properties using EVE Sun-as-a-star observations, opening doors to AR studies on other stars.
