Institute of Theoretical Astrophysics, University of Oslo, Post Office Box 1029, Blindern, NO-0315, Oslo, Norway.
Institute of Theoretical Astrophysics, University of Oslo, Post Office Box 1029, Blindern, NO-0315, Oslo, Norway. Lockheed Martin Solar and Astrophysics Laboratory, 3251 Hanover Street, Org. A021S, Building 252, Palo Alto, CA 94304, USA.
Science. 2014 Oct 17;346(6207):1255757. doi: 10.1126/science.1255757.
The heating of the outer solar atmospheric layers, i.e., the transition region and corona, to high temperatures is a long-standing problem in solar (and stellar) physics. Solutions have been hampered by an incomplete understanding of the magnetically controlled structure of these regions. The high spatial and temporal resolution observations with the Interface Region Imaging Spectrograph (IRIS) at the solar limb reveal a plethora of short, low-lying loops or loop segments at transition-region temperatures that vary rapidly, on the time scales of minutes. We argue that the existence of these loops solves a long-standing observational mystery. At the same time, based on comparison with numerical models, this detection sheds light on a critical piece of the coronal heating puzzle.
太阳外层大气层（即过渡区和日冕）的加热到高温是太阳（和恒星）物理学中的一个长期存在的问题。由于对这些区域的磁控制结构缺乏完整的理解，解决方案一直受到阻碍。日珥的界面区成像光谱仪（IRIS）在太阳边缘的高空间和时间分辨率观测揭示了大量快速变化的过渡区温度下的短而低的环或环段，其时间尺度为分钟。我们认为这些环的存在解决了一个长期存在的观测难题。同时，基于与数值模型的比较，这种探测为日冕加热难题的一个关键部分提供了线索。
