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首页> 外文期刊>The Astrophysical journal >SHORT-DURATION ACTIVE REGION BRIGHTENINGS OBSERVED IN THE EXTREME ULTRAVIOLET AND Hα BY THE SOLAR AND HELIOSPHERIC OBSERVATORY CORONAL DIAGNOSTIC SPECTROMETER AND HIDA DOMELESS SOLAR TELESCOPE
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SHORT-DURATION ACTIVE REGION BRIGHTENINGS OBSERVED IN THE EXTREME ULTRAVIOLET AND Hα BY THE SOLAR AND HELIOSPHERIC OBSERVATORY CORONAL DIAGNOSTIC SPECTROMETER AND HIDA DOMELESS SOLAR TELESCOPE

机译：太阳和球面观测冠状冠状动脉分光光度计和HIDA Dodoless太阳望远镜观察到的极端紫外线和Hα的短期持续活动区域变亮

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摘要

We present the first detection of an Hα counterpart to the EUV blinker. The observations come from a coordinated campaign between the Hida Observatory Domeless Solar Telescope (DST) and the Solar and Heliospheric Observatory Coronal Diagnostic Spectrometer (CDS) conducted in 2002 July and August. Utilizing studies designed for high-cadence observations, many short-duration brightenings (<3 minutes) were identified in the He Ⅰ λ584.334 and O Ⅴ λ1629.732 spectral lines in CDS data of active region NOAA 10039/10044. These brightenings show similar characteristics (increases in intensity, size) to longer duration EUV blinkers previously reported in active regions and the quiet Sun. Focusing on two events that show pronounced emission in the upper chromosphere (He Ⅰ), we have been able to identify cospatial bright points in the lower chromosphere (Hα center, +- 0.5 A) that show enhanced emission during the EUV blinker. These bright features have lifetimes similar to those of their EUV counterparts, and their peak intensities occur nearly simultaneously with the peak blinker intensities in the He Ⅰ and O Ⅴ lines. In both cases the He Ⅰ and O Ⅴ lines show excess line broadening at the peak of the event (>15 km s~(-1)). Our high-cadence observations also enabled us to examine the dimensions and lifetimes of short-duration active region blinkers in detail. We find that the instrumental spatial and temporal resolution can combine to distort their characteristics: even short-duration blinkers appear to be composed of elementary brightening events. The optical brightenings also appear to closely follow the behavior of the elementary brightenings. The spatial and temporal relationships between the brightenings indicate a causal link between the EUV and Hα blinkers.
机译：我们提出了首次检测到EUV信号灯的Hα对应物。这些观测结果来自飞弹天文台无圆顶太阳望远镜（DST）与太阳和日球天文台冠冕诊断光谱仪（CDS）之间在2002年7月和8月进行的协调运动。利用专为高频率观测而设计的研究，在活动区域​​NOAA 10039/10044的CDS数据中的HeⅠλ584.334和OⅤλ1629.732谱线中发现了许多短时变亮现象（<3分钟）。这些增亮显示出与以前在活跃区域和安静的太阳中报告的持续时间长的EUV闪光相似的特征（强度，尺寸增加）。着眼于两个在上层色球上显着发射的事件（HeⅠ），我们已经能够识别在下层色球层（Hα中心，±0.5 A）中的空间共鸣亮点，这些亮点在EUV眨眼期间显示出增强的发射。这些明亮的特征具有与EUV相似的寿命，并且其峰值强度几乎与HeⅠ和OⅤ线的峰值眨眼强度同时出现。在这两种情况下，HeⅠ和OⅤ谱线都在事件的峰值（> 15 km s〜（-1））处出现多余的谱线展宽。我们的高节奏观察还使我们能够详细检查短时活动区域闪烁灯的尺寸和使用寿命。我们发现仪器的空间和时间分辨率可以结合起来扭曲其特性：即使是短时的闪烁信号也似乎由基本的增亮事件组成。荧光增白剂似乎也与基本增白剂的行为密切相关。增亮之间的时空关系表明EUV和Hα眨眼之间存在因果关系。

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