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arXiv 1105.3244astro-ph.SR
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一个标准的井喷喷气式飞机

A standard-to-blowout jet

Chang Liu, Na Deng, Rui Liu, Ignacio Ugarte-Urra, Shuo Wang, Haimin Wang

摘要:

通常观测到的喷流提供了关于太阳大气中小规模能量释放的关键信息。我们报告了2010年7月20日太阳动力学观测站观测到的一个近盘中心喷流。在这一事件中,出现了一个跨度为9 x 10^3 km的磁通量和周围的开阔场之间的标准交换磁重联,随后是一个井喷式的喷发。在“标准”阶段,随着出现的负元素接近附近的正网络场,在喷射尖顶开始横向迁移之前,在EUV中具有圆顶状基部的喷射增长了30分钟,同时增强了通量出现。在“爆发”阶段,上述会聚场发生碰撞,随后的抵消产生了一个持续7分钟的紫外微耀斑,其中喷流的圆顶似乎被吹掉了,因为(1)尖顶摆动得更快,在消失之前表现出解旋运动,(2)一个上升的环和一个斑点爆发,留下尖形结构,斑点在耀斑最大值之后加速螺旋向外,(3)在色球层至过渡区温度下具有幕状结构的喷射物质也经历横向运动。因此,这表明耀斑重联迅速消除了新兴通量的外部场,使其扭曲的核心场爆发,这一情景有利于摩尔等人最近在2010年提出的喷流尺度磁爆发模型。

英文摘要:

The commonly observed jets provide critical information on the small-scale energy release in the solar atmosphere. We report a near disk-center jet on 2010 July 20, observed by the Solar Dynamics Observatory. In this event, the standard interchange magnetic reconnection between an emerging flux spanning 9 x 10^3 km and ambient open fields is followed by a blowout-like eruption. In the "standard" stage, as the emerging negative element approached the nearby positive network fields, a jet with a dome-like base in EUV grew for 30 minutes before the jet spire began to migrate laterally with enhanced flux emergence. In the "blowout" stage, the above converging fields collided and the subsequent cancellation produced a UV microflare lasting seven minutes, in which the dome of the jet seemed to be blown out as (1) the spire swung faster and exhibited an unwinding motion before vanishing, (2) a rising loop and a blob erupted leaving behind cusped structures, with the blob spiraling outward in acceleration after the flare maximum, and (3) ejecting material with a curtain-like structure at chromospheric to transition-region temperatures also underwent a transverse motion. It is thus suggested that the flare reconnection rapidly removes the outer fields of the emerging flux to allow its twisted core field to erupt, a scenario favoring the jet-scale magnetic breakout model as recently advocated by Moore et al. in 2010.

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