Space Weather Research Lab, New Jersey Institute of Technology, 323 Martin Luther King Blvd, Newark, NJ, 07102-1982, USA.
Big Bear Solar Observatory, New Jersey Institute of Technology, 40386 North Shore Lane, Big Bear City, CA, 92314-9672, USA.
Nat Commun. 2018 Jan 3;9(1):46. doi: 10.1038/s41467-017-02509-w.
As one of the most violent eruptions on the Sun, flares are believed to be powered by magnetic reconnection. The fundamental physics involving the release, transfer, and deposition of energy have been studied extensively. Taking advantage of the unprecedented resolution provided by the 1.6 m Goode Solar Telescope, here, we show a sudden rotation of vector magnetic fields, about 12-20° counterclockwise, associated with a flare. Unlike the permanent changes reported previously, the azimuth-angle change is transient and cospatial/temporal with Hα emission. The measured azimuth angle becomes closer to that in potential fields suggesting untwist of flare loops. The magnetograms were obtained in the near infrared at 1.56 μm, which is minimally affected by flare emission and no intensity profile change was detected. We believe that these transient changes are real and discuss the possible explanations in which the high-energy electron beams or Alfve'n waves play a crucial role.
作为太阳上最剧烈的爆发之一，耀斑被认为是由磁重联驱动的。涉及能量释放、传递和沉积的基本物理过程已经得到了广泛的研究。利用 1.6 米古德太阳望远镜提供的前所未有的分辨率，我们在这里展示了与耀斑相关的磁场矢量的突然旋转，大约逆时针旋转 12-20°。与以前报道的永久性变化不同，方位角的变化是瞬时的，与 Hα 发射共空间/共时。测量的方位角变得更接近位形场中的方位角，表明耀斑环的解缠。磁图是在近红外 1.56μm 处获得的，该波长受耀斑发射的影响最小，没有检测到强度轮廓变化。我们相信这些瞬态变化是真实的，并讨论了可能的解释，其中高能电子束或阿尔文波起着关键作用。
