JETS, CORONAL "PUFFS," AND A SLOW CORONAL MASS EJECTION CAUSED BY AN OPPOSITE-POLARITY REGION WITHIN AN ACTIVE REGION FOOTPOINT
JETS, CORONAL "PUFFS," AND A SLOW CORONAL MASS EJECTION CAUSED BY AN OPPOSITE-POLARITY REGION WITHIN AN ACTIVE REGION FOOTPOINT
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DOI：
10.3847/0004-637x/823/2/129
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发表时间：
2016-06-01
影响因子：
4.9
通讯作者：
Morgan, H.
中科院分区：
文献类型：
--
作者：
Alzate, N.;Morgan, H.
从 2013 年 1 月 17 日开始的三天内，在活动区域一个足点内嵌入的反向通量小区域内发生了 12 个重复的重联事件，伴随着极紫外光中观察到的耀斑和喷流以及日冕仪观察到的快速而微弱的无结构“喷流”。在同一时期，缓慢结构的日冕物质抛射逐渐爆发，其一端锚定在喷射区域附近或内部。其中四次喷流事件成对发生——一股狭窄的主喷流在几十分钟内紧随其后的是一股更宽、更大的喷流。所有喷气式飞机都很慢，表观速度大约为 100 km s(-1)。日冕仪数据中宽粉团的速度类似于 300 km s(-1)，并且它们出现的时间排除了与 EUV 喷射材料的直接关联。射流物质沿着大范围的闭场环传播，并且不会逃逸到延伸的日冕。重新连接后闭环的快速重新配置会导致向外传播的扰动或波前，这在日冕仪数据中表现为烟雾。此外，新扩张的封闭通量管形成压力不平衡，这可能导致二次射流。通过经常性的场重新配置，重联事件也导致结构通量管逐渐喷发，表现为缓慢的日冕物质抛射。由耀斑/喷射引起的微弱传播日冕扰动可能很常见，但通常会被相关的喷射所掩盖。有时，相关的物质喷射不存在，并且可以清楚地观察到日冕喷发。
During a period of three days beginning 2013 January 17, twelve recurrent reconnection events occur within a small region of opposing flux embedded within one footpoint of an active region, accompanied by flares and jets observed in EUV and fast and faint structureless "puffs" observed by coronagraphs. During the same period a slow structured CME gradually erupts, with one end anchored close to, or within, the jetting region. Four of the jet events occur in pairs-a narrow, primary jet followed within a few tens of minutes by a wider, more massive, jet. All the jets are slow, with an apparent speed of similar to 100 km s(-1). The speed of the wide puffs in the coronagraph data is similar to 300 km s(-1), and the timing of their appearance rules out a direct association with the EUV jetting material. The jet material propagates along large-scale closed-field loops and does not escape to the extended corona. The rapid reconfiguration of the closed loops following reconnection causes an outwardly propagating disturbance, or wave front, which manifests as puffs in coronagraph data. Furthermore, the newly expanded closed flux tube forms a pressure imbalance, which can result in a secondary jet. The reconnection events, through recurrent field reconfiguration, also leads to the gradual eruption of the structured flux tube appearing as the slow CME. Faint propagating coronal disturbances resulting from flares/jets may be common, but are usually obscured by associated ejections. Occasionally, the associated material ejections are absent, and coronal puffs may be clearly observed.