论文标题
在太阳预闪际阶段观察冠状环和微波通量中的准周期脉动的观察
Observations of a quasi-periodic pulsation in the coronal loop and microwave flux during a solar preflare phase
论文作者
论文摘要
我们报告了从EUV图像处的冠状循环的空间位移和在2016年3月23日的C1.1 Flare的冠状图像和微波发射中同时检测到的准周期性脉动（QPP）事件。波长为171 A的序列，初始振荡周期估计为〜397 s，生长速度缓慢为0.045。同时，在同一活性区域的微波通量中发现了从大约300 s增长到近500 s的QPP。基于AIA在EUV波长和Microwave 17 GHz上测得的成像观察，Nobeyama Roadiosograph，发现通过在QPP的波长中，QPR的生长时，发现弥漫性冠状环和微波辐射源是通过AIA图像在AIA图像中看到的热循环的连接的 环形。电流的存在可能意味着在前膜阶段源区域中的非电位。
We report a quasi-periodic pulsation (QPP) event simultaneously detected from the spatial displacements of coronal loop at both EUV images and microwave emission during the preflare phase of a C1.1 flare on 2016 March 23. Using the motion magnification technique, a low-amplitude transverse oscillation with the growing period is discovered in a diffuse coronal loop in Atmospheric Imaging Assembly (AIA) image sequences at wavelength of 171 A, and the initial oscillation period is estimated to be ~397 s with a slow growth rate of 0.045. At the same time, a QPP with growing periods from roughly 300 s to nearly 500 s is discovered in the microwave flux in the same active region. Based on the imaging observations measured at EUV wavelengths by the AIA and at microwave 17 GHz by Nobeyama Radioheliograph, the diffuse coronal loop and the microwave radiation source are found to be connected through a hot loop seen in AIA images at wavelength of 94 A. The growing period of the QPP should be related to the modulation of LRC-circuit oscillating process in a current-carrying plasma loop. The existence of electric currents may imply the non-potentialities in the source region during the preflare phase.
