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ACTIVE REGION STREAMER DIAGNOSTICS 2001 SEPTEMBER 14-16

机译:活动区域流诊断2001年9月14日至16日

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From 2001 September 14 to 16 the Ultraviolet Coronal Spectrometer aboard the Solar and Heliospheric Observatory conducted a series of observations designed to study the absolute elemental abundances of an active region streamer. The absolute elemental abundances for O, Si, Fe, Mg, N, S, and Ar were calculated utilizing a constant electron temperature technique and an alternative approach to the emission measure technique, both producing complementary results. The manifestation of the first ionization potential (FIP) effect was observed here as in previous streamers. Two aspects of this streamer make it unusual and worth special attention. The active region streamer observed possessed an abundance-depleted core typically, although not exclusively, seen in quiescent streamers. A coronal mass ejection (CME) occurred at the active region during the observations. This event resulted in the second unexpected aspect of this streamer, its quick return to the same general abundance characteristics that existed before the CME occurred. The re-formation of a depleted core and the presence of the FIP effect immediately after a highly disruptive event are surprising given the 1 day timescale predicted by streamer theories.
机译:从2001年9月14日至16日,太阳和日球天文台上的紫外线日冕光谱仪进行了一系列观测,旨在研究活动区域拖缆的绝对元素丰度。 O,Si,Fe,Mg,N,S和Ar的绝对元素丰度是使用恒定电子温度技术和发射测量技术的替代方法计算得出的,两者均产生互补的结果。与以前的拖缆一样,这里观察到了第一电离势(FIP)效应的表现。该拖缆的两个方面使其不寻常且值得特别注意。观察到的活动区域拖缆通常具有(但不排他地)在静态拖缆中看到的耗尽核心。在观察期间,在活动区域​​发生了冠状物质抛射(CME)。此事件导致了此拖缆的第二个意外方面,即它迅速恢复到CME发生之前所具有的一般丰度特征。考虑到流光理论预测的1天时间尺度,在高度破坏性事件之后,耗尽核的重新形成和FIP效应的存在令人惊讶。

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