Identification of Low Coronal Sources of "Stealth" Coronal Mass Ejections Using New Image Processing Techniques
Identification of Low Coronal Sources of "Stealth" Coronal Mass Ejections Using New Image Processing Techniques
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DOI：
10.3847/1538-4357/aa6caa
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发表时间：
2017-05-10
影响因子：
4.9
通讯作者：
Morgan, Huw
中科院分区：
文献类型：
--
作者：
Alzate, Nathalia;Morgan, Huw
日冕物质抛射 (CME) 通常与低日冕特征 (LCS) 相关，例如耀斑、灯丝喷发、极紫外 (EUV) 波或喷流。最近的一些研究报告了隐形日冕物质抛射作为没有濒海战斗舰事件的存在，这可能是由于观测的局限性。我们的研究重点是 D'Huys 等人的研究中确定的一组 40 个隐形日冕物质抛射。新的图像处理技术应用于跨越每个日冕物质抛射的起始和传播时间的高节奏、多仪器图像集，以搜索可能的濒海战斗舰。其中 23 个事件被确定为小型、低质量、非结构化的斑点或喷发，通常发生在大型日冕物质抛射之后，但与小型耀斑、喷流或细丝喷发等 LCS 相关。在较大的日冕物质抛射中，七个与喷气机有关，另外八个与喷气机有关。伴有丝状喷发。其中一些细丝喷发与喷发细丝/通量管的标准模型不同，因为它们是大而微弱的通量管的喷发，这些通量管在缓慢喷发之前似乎在很高的高度存在了很长一段时间。对于其中两个事件，。我们在大角度光谱日冕仪 C2 图像中看到了一次喷发，并在 EUV 图像中看到了喷发底部边缘随之发生的变化。我们研究中的所有 40 个事件都与某种形式的 LCS 相关。我们得出的结论是，隐形日冕物质抛射是由于观测和处理的限制而产生的。
Coronal mass ejections (CMEs) are generally associated with low coronal signatures (LCSs), such as flares, filament eruptions, extreme ultraviolet (EUV) waves, or jets. A number of recent studies have reported the existence of stealth CMEs as events without LCSs, possibly due to observational limitations. Our study focuses on a set of 40 stealth CMEs identified from a study by D'Huys et al. New image processing techniques are applied to high-cadence, multi-instrument sets of images spanning the onset and propagation time of each of these CMEs to search for possible LCSs. Twenty-three of these events are identified as small, low-mass, unstructured blobs or puffs, often occurring in the aftermath of a large CME, but associated with LCSs such as small flares, jets, or filament eruptions. Of the larger CMEs, seven are associated with jets and eight. with filament eruptions. Several of these filament eruptions are different from the standard model of an erupting filament/flux tube in that they are eruptions of large, faint flux tubes that seem to exist at large heights for a long time prior to their slow eruption. For two of these events,. we see an eruption in Large Angle Spectrometric Coronagraph C2 images and the consequent changes at the bottom edge of the eruption in EUV images. All 40 events in our study are associated with some form of LCS. We conclude that stealth CMEs arise from observational and processing limitations.