arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2203.02420astro-ph.SR
收藏

耀斑期间太阳大气声振荡的频率分布

Frequency Distribution of Acoustic Oscillation in the Solar Atmosphere During Flare Event

A. Wisniewska, E. Chmielewska, K. Radziszewski, M. Roth, J. Staiger

摘要:

本文对2015年5月23日在活动区NOAA 12353观测到的一次C 2.3太阳耀斑进行了多波长观测研究,揭示了耀斑区声波的新特性。本文使用了在真空塔望远镜、大气成像装置和太阳动力学观测站上的日震和磁成像仪上运行的大区域干涉仪测量的空间和地面数据。首先,利用太阳振荡的功率谱,我们确定了主频率和它们的位置在七个不同的大气层耀斑事件之前和之后。其次,基于AIA在6个极紫外滤光片上的观测数据,我们得到了耀斑的差分辐射测量(DEM)剖面和DEM图。最后,我们确认了活动区磁场的σ-分类,它与耀斑直接相关。我们的结果如下:耀斑爆发前后,光球中的高频波(ν>5 mHz)都是在色球环的足点产生的,而在色球(Hα线)中,耀斑爆发前的功率增强表现为耀斑发射的最大值,而爆发后的所有频率的增强只在耀斑后的环区观察到。此外,耀斑爆发前孔隙周围区域的振荡功率具有随机性,而耀斑爆发后,振荡功率集中在孔隙内,而在孔隙外减弱。我们的结论是,在活动区域中的高频声波的准确检测可以导致更快,更容易的预测高能量事件。

英文摘要:

We present a study of multi-wavelength observations, of a C 2.3 solar flare in Active Region NOAA 12353, observed on 2015 May 23, which reveal new properties of acoustic waves in the flaring region. The space-, and ground-based data measured by the HELioseismological Large Regions Interferometric Device, operating at the Vacuum Tower Telescope, the Atmospheric Imaging Assembly, and Helioseismic and Magnetic Imager on board the Solar Dynamic Observatory, were used in this paper. First, using power spectra of solar oscillations, we identified the dominant frequencies and their location at seven different atmospheric levels before and after the flare event. Second, based on AIA observations taken in six Extreme Ultraviolet filters, we derived Differential Emission Measure (DEM) profiles and DEM maps of the flare. Finally, we confirm the σ-classification of the magnetic field in the active area, directly related to the flare. Our results are as follows: the high-frequency waves (ν>5 mHz) in the photosphere, in both cases, before and after the flare, are generated at the foot-points of the chromospheric loop, while in the chromosphere (Hα line), before the event the power enhancement exhibits for maximum of flare emission, and after the eruption the enhancement by all frequencies is observed only in the post flare loop area. Moreover, the power of oscillation in the pores surrounding area before the flare has a random character, while after the flare oscillation's power is concentrated in the pore, and weakened outside of. We conclude that the accurate detection of high-frequency acoustic waves in the active regions can lead to faster and easier prediction of high-energy events.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑