arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1707.05080astro-ph.SR
收藏

IRIS爆发光谱与安静太阳Ellerman样增亮同空间

IRIS Burst Spectra Co-Spatial To A Quiet-Sun Ellerman-Like Brightening

C. J. Nelson, N. Freij, A. Reid, R. Oliver, M. Mathioudakis, R. Erdélyi

摘要:

埃勒曼炸弹(EB)在过去的二十年里得到了广泛的研究;然而,直到最近才在安静的太阳中观察到这些事件的对应物。本文的目的是进一步了解小规模的安静太阳Ellerman样增亮(QSEBs)通过研究他们的光谱特征,包括调查是否与一些EB相关的热签名也是可见的任何QSEBs的空间。我们结合H $α$和Ca II $8542$在太阳边缘的光谱和成像数据采样的接口区域成像光谱仪(IRIS)。鉴定出21个QSEB,其平均寿命、长度和宽度分别测量为大约$120$“、$0.63$“和$0.35$“。其中三个QSEBs显示出明确的重复燃烧,通过他们的生命周期,在活动区(AR)的EB的行为。在SDO/AIA $1600$和IRIS裂隙颌成像仪$1400$的数据中,该样本中的两个QSEB与发射增加共空间发生,然而,这些强度增加小于与EB共空间报告的强度增加。一个QSEB在其寿命期间也被IRIS狭缝取样,显示Si IV $1393$和Si IV $1403$核心以及C II和Mg II线翼的强度增加,类似于IRIS爆发(IB)。使用RADYN模拟,我们无法重现所观察到的QSEB H $α$和钙II $8542$的轮廓线离开QSEB的温度分层的问题开放。我们的研究结果表明,一些QSEBs可以加热到过渡区的温度,这表明IB配置文件应在整个安静的太阳。

英文摘要:

Ellerman bombs (EBs) have been widely studied over the past two decades; however, only recently have counterparts of these events been observed in the quiet-Sun. The aim of this article is to further understand small-scale quiet-Sun Ellerman-like brightenings (QSEBs) through research into their spectral signatures, including investigating whether the hot signatures associated with some EBs are also visible co-spatial to any QSEBs. We combine H$α$ and Ca II $8542$ Å line scans at the solar limb with spectral and imaging data sampled by the Interface Region Imaging Spectrograph (IRIS). Twenty one QSEBs were identified with average lifetimes, lengths, and widths measured to be around $120$ s, $0.63$", and $0.35$", respectively. Three of these QSEBs displayed clear repetitive flaring through their lifetimes, comparable to the behaviour of EBs in Active Regions (ARs). Two QSEBs in this sample occurred co-spatial with increased emission in SDO/AIA $1600$ Å and IRIS slit-jaw imager $1400$ Å data, however, these intensity increases were smaller than reported co-spatial to EBs. One QSEB was also sampled by the IRIS slit during its lifetime, displaying increases in intensity in the Si IV $1393$ Å and Si IV $1403$ Å cores as well as the C II and Mg II line wings, analogous to IRIS bursts (IBs). Using RADYN simulations, we are unable to reproduce the observed QSEB H$α$ and Ca II $8542$ Å line profiles leaving the question of the temperature stratification of QSEBs open. Our results imply that some QSEBs could be heated to Transition Region temperatures, suggesting that IB profiles should be observed throughout the quiet-Sun.

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。

↑