arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1807.01449astro-ph.SR
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IRIS观测的太阳互联网中声波的垂直传播

Vertical Propagation of Acoustic Waves in the Solar Inter-Network as Observed by IRIS

P. Kayshap, K. Murawski, A. K. Srivastava, Z. E. Musielak, B. N. Dwivedi

摘要:

利用界面区成像光谱仪(IRIS)对宁静太阳(QS)的观测,研究了光球过渡区(TR)中声波的传播。我们选取了几条IRIS谱线,包括光球层(Mn { \sc i} 2801.25~ K)、色球层(Mg { \sc ii} k 2796.35~ K)和TR(C { \sc ii} 1334.53~ K),研究了声波在光球层和色球层之间的传播.几分钟的振荡(即,周期为1.6 - 4.0分钟)成功地从光球层传播到色球层,这是由正相位滞后的优势所证实的。然而,在更高的周期制度(即,大于$\approx$ 4.5分钟),则向下传播占主导地位是由负相位滞后所明显的。波的广谱(即,2.5-6.0分钟)从色球层自由向上传播到TR。我们发现只有大约45%的位置(70%)显示色球层和TR之间的相关性。我们的结果表明,色球层/TR内观测到的3分钟振荡的根源位于光球层。观测还表明,5分钟振荡从色球层向下传播。\textbf{However, some locations within QS also show successful propagation of 5 minute oscillations as revealed by positive phase lags, which might be the result of magnetic field}。此外,我们的研究结果清楚地表明,一个显着的权力,从2.5到6.0分钟的时间范围内,太阳色球自由传输到TR触发大气振荡。我们的观测结果的理论意义进行了讨论。

英文摘要:

We investigate the Interface Region Imaging Spectrograph (IRIS) observations of the quiet-Sun (QS) to understand the propagation of acoustic waves in transition region (TR) from photosphere. We selected a few IRIS spectral lines, which include the photospheric (Mn~{\sc i} 2801.25~Å), chromospheric (Mg~{\sc ii} k 2796.35~Å) and TR (C~{\sc ii} 1334.53~Å), to investigate the acoustic wave propagation.The wavelet cross-spectrum reveals significant coherence (about 70\% locations) between photosphere and chromosphere. Few minutes oscillations (i.e., period range from 1.6 to 4.0 minutes) successfully propagate into chromosphere from photosphere, which is confirmed by dominance of positive phase lags. However, in higher period regime (i.e., greater than $\approx$ 4.5 minutes), the downward propagation dominates is evident by negative phase lags. The broad spectrum of waves (i.e., 2.5-6.0 minutes) propagates freely upwards from chromosphere to TR. We find that only about 45\% locations (out of 70\%) show correlation between chromosphere and TR. Our results indicate that roots of 3 minutes oscillations observed within chromosphere/TR are located in photosphere. Observations also demonstrate that 5 minute oscillations propagate downward from chromosphere. \textbf{However, some locations within QS also show successful propagation of 5 minute oscillations as revealed by positive phase lags, which might be the result of magnetic field}. In addition, our results clearly show that a significant power, within period ranging from 2.5 to 6.0 minutes, of solar chromosphere is freely transmitted into TR triggering atmospheric oscillations. Theoretical implications of our observational results are discussed.

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