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arXiv 2102.13362astro-ph.SR
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用太阳动力学观测站的EVE和AIA资料校正He PDKEEPAAA30.38 nm谱线的多普勒频移

Correcting Doppler Shifts in He II 30.38 nm Line by Using the EVE and AIA data from Solar Dynamics Observatory

Zhixun Cheng, Yuming Wang, Rui Liu

摘要:

太阳动力学天文台(SDO)上的极紫外变率实验(EVE)以高的时间节奏和光谱分辨率探测太阳极紫外光谱。发射线的波长变化提供了太阳动力学的关键信息。然而,一些EVE光谱观测受到太阳辐照度不均匀分布的影响,这可能会妨碍我们正确理解日冕中发生的物理过程。在此,基于2011年1月27日唯一公布的EVE He II 30.38 nm谱线在轨标定数据(Chamberlin,2016),我们开发了一种利用AIA 304成像数据校正He II 30.38 nm谱线的方法。利用2010年10月29日至2011年3月3日的EVE He II 30.38 nm数据,研究了太阳He II 30.38 nm谱线的多普勒振荡,发现半个月周期的多普勒振荡主要是由于活动区的存在引起的辐射不均匀分布引起的.其他EVE日冕线也呈现类似的多普勒振荡,这表明在解释这些线中出现的振荡现象之前必须进行适当的校正。

英文摘要:

The Extreme-ultraviolet Variability Experiment (EVE) onboard the Solar Dynamics Observatory (SDO) detects the solar EUV spectra with high temporal cadence and spectral resolution. The wavelength shifts of emission lines provide key information of the dynamics of the Sun. However, some of EVE spectral observations are influenced by the non-uniformly distributed irradiance on the Sun, which may prevent us from correctly understanding the physical processes happened in the solar corona. Here, based on the only published on-orbit calibration data of EVE He II 30.38 nm line on 27 Jan 2011 (Chamberlin, 2016), we develop a method to correct the He II 30.38 nm line by using AIA 304 imaging data. This correction method is then applied to EVE He II 30.38 nm data from 29 Oct 2010 to 3 Mar 2011 to study the Doppler oscillations of the solar He II 30.38 nm line, in which we show that the half-month periodic Doppler oscillation is caused by non-uniformly distributed irradiance mainly due to the presence of active regions. Other EVE coronal lines also present similar Doppler oscillations, suggesting that an appropriate correction must be implemented before interpret the oscillation phenomena appearing in these lines.

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