Spicules in IRIS Mg ii Observations: Automated Identification
Spicules in IRIS Mg ii Observations: Automated Identification
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DOI：
10.3847/1538-4357/acbe3f
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Vicki Herde;P. Chamberlin;D. Schmit;S. Bose;A. Daw;R. Milligan;V. Polito
中科院分区：
文献类型：
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作者：
Vicki Herde;P. Chamberlin;D. Schmit;S. Bose;A. Daw;R. Milligan;V. Polito
我们已经开发了一种算法来识别太阳针状体，这是有史以来第一次专门利用镁II光谱观测对盘上针状体进行的系统调查。使用该算法，我们识别了三个界面区成像光谱仪(IRIS)数据集中的2021个事件，这些数据集中有唯一的太阳特征目标，总跨度为300分钟：(1)活动区，(2)衰变活动区/活动网络，(3)冕洞。我们给出了事件统计数据，并将出现率与光球层下的磁场强度联系起来。这种方法识别针刺事件密度和出现率，类似于以前使用Hα和钙离子观察活动区进行的研究。此外，这项研究在磁场强度低于20G时发现了非常低的针状物事件，在活动区在100到200G之间显著增加，在冕洞中在20G以上，这可以用来为未来的观测活动提供信息。这些信息可以用来帮助描述针状物整个寿命的特征，并补充了现有的Hα光谱能力和即将使用太阳喷发积分场光谱仪探测火箭进行的Lyα光谱观测。总而言之，这项研究提出了一种专门使用镁离子光谱来探测太阳针状物的方法，并提供了关于磁场强度的关于镁元素Ⅱh线中针状物出现的统计数据，目的是为了预测针状物的出现。
We have developed an algorithm to identify solar spicules in the first ever systematic survey of on-disk spicules exclusively using Mg ii spectral observations. Using this algorithm we identify 2021 events in three Interface Region Imaging Spectrograph (IRIS) data sets with unique solar feature targets spanning a total of 300 minutes: (1) active region, (2) decayed active region/active network, and (3) coronal hole. We present event statistics and relate occurrence rates to the underlying photospheric magnetic field strength. This method identifies spicule event densities and occurrence rates similar to previous studies performed using Hα and Ca ii observations of active regions. Additionally, this study identifies spicule-like events at very low rates at magnetic field intensities below 20 G, and increasing significantly between 100 and 200 G in active regions and above 20 G in coronal holes, which can be used to inform future observation campaigns. This information can be be used to help characterize spicules over their full lifetimes, and compliments existing Hα spectral capabilities and upcoming Lyα spectral observations with the Solar eruptioN Integral Field Spectrograph (SNIFS) sounding rocket. In total, this study presents a method for detecting solar spicules exclusively using Mg ii spectra, and provides statistics for spicule occurrences in the Mg ii h line with respect to the magnetic field strength for the purpose of predicting spicule occurrences.