论文标题

振荡区域中振荡的功率分布:与ALMA,IRIS和SDO的关节观测

Power distribution of oscillations in the atmosphere of a plage region: Joint observations with ALMA, IRIS and SDO

论文作者

Narang, Nancy, Chandrashekhar, Kalugodu, Jafarzadeh, Shahin, Fleck, Bernhard, Szydlarski, Mikołaj, Wedemeyer, Sven

论文摘要

我们介绍了与ALMA(Atacama大毫米/亚毫米阵列),IRIS(界面区域成像光谱仪)和SDO(太阳能动态观测师)共同观察到的活性区域NOAA AR12651中振荡区域振荡分布的统计分析。我们在2796ÅPass带中采用协调的ALMA Band-6(1.25毫米)亮度温度图,虹膜缝隙式图像,并在六个通带(1600Å,304Å,304Å,131Å,171Å,193Å,193Å和211Å)中进行AIA(大气成像组件)在板上Sdo上。我们执行Lomb-Scargle的转换,通过主要的周期图和功率图研究观察到的区域上振荡能力的分布。我们研究了通过不同的通带映射的大气的空间关联,重点是阿尔玛振荡与他人的功率分布相关。我们没有观察到ALMA振荡与虹膜和AIA振荡的任何显着关联。尽管Alma显性振荡的全球行为与AIA的过渡区域和冠状宽带的振荡相似,但Alma主导的时期图和功率图与其他PassBands的相关性并未显示出任何相关性。在不同时期间隔中,在ALMA振荡的不同时期间隔的空间分布与任何其他通带无关。我们推测ALMA振荡与IRIS和AIA的振荡是由于Alma观察到的毫米连续体的形成高度的显着差异。此外,与虹膜和AIA的强度观察相比,ALMA直接映射了亮度温度,与IRIS和AIA振荡相比,ALMA振荡的内在性质截然不同。

We present a statistical analysis of power distribution of oscillations in a plage region in active region NOAA AR12651, observed jointly with ALMA (Atacama Large Millimeter/Submillimeter Array), IRIS (Interface Region Imaging Spectrograph), and SDO (Solar Dynamics Observatory). We employ coordinated ALMA Band-6 (1.25 mm) brightness temperature maps, IRIS Slit-Jaw Images in 2796 Å passband, and observations in six passbands (1600 Å, 304 Å, 131 Å, 171 Å, 193 Å and 211 Å) of AIA (Atmospheric Imaging Assembly) onboard SDO. We perform Lomb-Scargle transforms to study the distribution of oscillation power over the observed region by means of dominant period maps and power maps. We study spatial association of oscillations through the atmosphere mapped by the different passbands, with focus on the correlation of power distribution of ALMA oscillations with others. We do not observe any significant association of ALMA oscillations with IRIS and AIA oscillations. While the global behavior of ALMA dominant oscillations shows similarity with that of transition region and coronal passbands of AIA, the ALMA dominant period maps and power maps do not show any correlation with those from the other passbands. The spatial distribution of dominant periods and power in different period intervals of ALMA oscillations is uncorrelated with any other passband. We speculate the non-association of ALMA oscillations with those of IRIS and AIA be due to significant variations in the height of formation of the millimeter continuum observed by ALMA. Additionally, the fact that ALMA directly maps the brightness temperature, in contrast to the intensity observations by IRIS and AIA, can result in the very different intrinsic nature of the ALMA oscillations compared to the IRIS and AIA oscillations.

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