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Chromospheric Internetwork Oscillations at Various Locations of the Quiet Sun

机译:寂静的太阳在各个位置的色度网络互联振荡

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摘要

We analyze oscillation behaviours in chromospheric internetwork regions using spectral observations of the CⅡ 1334 A line obtained with the Solar Ultraviolet Measurements of Emitted Radiation spectrograph (SUMER) aboard Solar and Heliospheric Observatory (SOHO). Three areas, 26 x 120 arcsec~2 each, at the various latitudes from the disk center to the north polar coronal hole, were rastered with a cadence of about 40-60 s in the solar minimum year. We obtained the time evolution of two-dimensional (2D) line intensity, continuum and line core shift. The continuum and the line shift show ~3 min chromospheric oscillations in the internetwork regions underlying the coronal hole as well as at the disk center. We find that the CⅡ 1334 A line shift oscillates with an average speed of ~1.7 km s~(-1), independent of the latitude, while its coherent scale decreases with latitude. On the other hand, the oscillation amplitude of the continuum around the 1334 A and the phase delay between the Doppler shift and continuum slightly increase with latitude.
机译:我们使用太阳和日球天文台(SOHO)上的太阳紫外线发射光谱仪(SUMER)获得的CⅡ1334 A线的光谱观察结果,分析了在色层互联网络区域中的振荡行为。从最低的年份开始,在从圆盘中心到北极极冠孔的各个纬度上的三个区域(每个26 x 120 arcsec〜2)以大约40-60 s的节奏进行了栅格化。我们获得了二维(2D)线强度,连续性和线芯偏移的时间演化。连续体和线位移表明在冠状孔下面和盘中心的网状区域中约有3分钟的色球振荡。我们发现,CⅡ1334A线位移以〜1.7 km s〜(-1)的平均速度振荡,与纬度无关,而其相干尺度随纬度减小。另一方面,围绕1334 A的连续谱的振荡幅度以及多普勒频移和连续谱之间的相位延迟随纬度略有增加。

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