arXiv 1903.012012019-03-04astro-ph.SR

喷流前爆发重联反转的观测：振荡磁重联的证据？

Observation of a reversal of breakout reconnection preceding a jet: evidence of oscillatory magnetic reconnection?

Junchao Hong, Jiayan Yang, Huadong Chen, Yi Bi, Bo Yang, Hechao Chen

备注：: 13 pages, 5 figures, accepted for publication in ApJ
DOI：: 10.3847/1538-4357/ab0c9d

摘要：

最近的研究表明，太阳喷流涉及minifilament爆发可能引发下著名的磁爆发机制。在这些喷流开始之前或刚刚开始时，应该有一个电流片，在开放场和喷流基础拱廊的外部之间发生突破性的磁重联，拱廊在其核心中携带微丝。在本文中，我们提出了一个喷流的爆发所产生的两个微细丝躺在射流的基础。在喷发开始前，在喷流底部附近直接检测到电流片，这表明了磁爆发机制。然而，我们进一步发现，电流片经历了一个过渡。电流片首先缩短到零长度，但随后相对于其初始取向朝向正交方向伸长。电流片的变化引起了突破重联的逆转，因为过渡前的流入和流出区域分别成为过渡后的流出和流入区域。因此，我们建议，这一观察提供了所谓的振荡重联，这是由一系列的重联逆转定义，但尚未被证明存在于真正的等离子体环境中的太阳大气的证据。

英文摘要：

Recent studies have revealed that solar jets involving minifilament eruptions may be initiated under the well-known magnetic-breakout mechanism. Before or just at the onset of those jets, there should be a current sheet, where breakout magnetic reconnection takes place, between open fields and the outside of the jet-base arcade carrying minifilament in its core. In this paper we present a jet produced by eruption of two minifilaments lying at the jet base. A current sheet is directly detected near the jet base before the onset of the eruption, suggesting the magnetic-breakout mechanism. However, we further find that the current sheet undergoes a transition. The current sheet first shortens to zero in length, but then lengthens towards an orthogonal direction relative to its initial orientation. The change of the current sheet gives rise to a reversal of the breakout reconnection, as the inflow and outflow regions before the transition become the outflow and inflow regions after the transition, respectively. We therefore propose that this observation provides evidence for the so-called oscillatory reconnection which is defined by a series of reconnection reversals but not yet proved to exist in real plasma environment of the solar atmosphere.

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