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arXiv 1702.05136astro-ph.SR
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一次失败的太阳暗条爆发中的等离子体增亮

Plasma Brightenings in a Failed Solar Filament Eruption

Y. Li, M. D. Ding

摘要:

失败的暗条爆发是指与日冕物质抛射无关的太阳爆发。在一个失败的灯丝爆发,灯丝材料通常会显示一些上升和下降的运动,以及产生明亮的EUV辐射。在这里,我们报告了一个失败的灯丝喷发,发生在一个安静的太阳区域观察到的大气成像组件上的太阳动力学天文台。在这种情况下,灯丝展开,但受到周围磁场的限制。当与周围的磁场相互作用时,灯丝材料变亮,并沿着磁场线通过日冕流到色球层。我们发现,某些物质沿着包含暗条的提升磁结构向下滑动,通过动能耗散,撞击色球层,在很宽的温度范围内产生两个带状增亮。有证据表明,磁重联发生在灯丝磁结构和周围的磁场之间的灯丝等离子体被加热到日冕温度。此外,在低温下爆发的磁场上方会出现线状增亮,这可能是由于等离子体稀薄导致辐射冷却快速下降而产生的能量不平衡。因此,这一单一的失败的灯丝喷发事件表明存在各种等离子体增亮,可能是由完全不同的加热机制。

英文摘要:

Failed filament eruptions are solar eruptions that are not associated with coronal mass ejections. In a failed filament eruption, the filament materials usually show some ascending and falling motions as well as generate bright EUV emissions. Here we report a failed filament eruption that occurred in a quiet-Sun region observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. In this event, the filament spreads out but gets confined by the surrounding magnetic field. When interacting with the ambient magnetic field, the filament material brightens up and flows along the magnetic field lines through the corona to the chromosphere. We find that some materials slide down along the lifting magnetic structure containing the filament and impact the chromosphere to cause two ribbon-like brightenings in a wide temperature range through kinetic energy dissipation. There is evidence suggesting that magnetic reconnection occurs between the filament magnetic structure and the surrounding magnetic fields where filament plasma is heated to coronal temperatures. In addition, thread-like brightenings show up on top of the erupting magnetic fields at low temperatures, which might be produced by an energy imbalance from a fast drop of radiative cooling due to plasma rarefaction. Thus, this single event of failed filament eruption shows existence of a variety of plasma brightenings that may be caused by completely different heating mechanisms.

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