使用ARTEMIS-JLS和NRH进行高分辨率观测。III。光纤爆的光谱学和成像
High-resolution observations with ARTEMIS-JLS and the NRH. III. Spectroscopy and imaging of fiber bursts
摘要：
目的：研究2000年7月14日太阳大事件中的中间漂移爆发（纤维）的特征。研究方法：我们使用的动态光谱从声光分析仪（SAO）的ARTEMIS-JLS太阳射电光谱仪，结合高时间分辨率的图像从南岛射电日像仪（NRH）和EUV图像从TRACE。我们计算了2维和1维图像，并将高通时间滤波应用于图像和动态光谱，以增强纤维。为了研究背景连续辐射，我们使用了几秒钟内的平均图像。结果：在NRH图像中，SAO动态谱中的所有纤维都可以识别。在一次能量释放后，在一个移动的IV型，可能与快速向东扩张的耀斑和postflare环拱廊的纤维首次检测到。它们表现为连续谱强度的10%调制。在普通模式意义上的纤维和连续的强烈圆偏振，表示基本的等离子体发射。我们检测到离散的纤维源沿两个~300，微米长的平行条纹，显然是大规模的环段，包括EUV环和通量绳。我们发现多个光纤发射在略有不同的位置和时间，他们的连续出现可以给人的印象，视运动与超光速。单个纤维的图像在432.0和327.0 MHz下非常相似。从源的位置偏移和在低和高频率的时间延迟，我们估计，对于一组观察良好的纤维，激励器的速度和频率尺度长度沿循环，我们得到一致的值从成像和光谱数据，支持哨声起源的纤维发射。作为同一波列的表现，吸收和发射的纤维非常相似。
英文摘要：
Aims: We study the characteristics of intermediate drift bursts (fibers) embedded in the July 14, 2000 large solar event. Methods: We used dynamic spectra from the acousto-optic analyzer (SAO) of the ARTEMIS-JLS solar radiospectrograph, in conjunction with high time resolution images from the Nanc cay Radioheliograph (NRH) and EUV images from TRACE . We computed both 2-dimensional and 1-dimensional images and applied high pass time filtering to the images and the dynamic spectrum in order to enhance the fibers. For the study of the background continuum emission we used images averaged over several seconds. Results: All fibers in the SAO dynamic spectra are identifiable in the NRH images. Fibers were first detected after the primary energy release in a moving type IV, probably associated with the rapid eastward expansion of the flare and the postflare loop arcade. They appeared as a 10% modulation of the continuum intensity. The fibers and the continuum were strongly circularly polarized in the ordinary mode sense, indicating fundamental plasma emission. We detected discrete fiber sources along two ~300, Mm long parallel stripes, apparently segments of large scale loops encompassing both the EUV loops and the flux rope. We found multiple fiber emissions at slightly different positions and times; their consecutive appearance can give the impression of apparent motion with supra-luminal velocities. Images of individual fibers were very similar at 432.0 and 327.0 MHz. From the position shift of the sources and the time delays at low and high frequencies we estimated, for a well observed group of fibers, the exciter speed and the frequency scale length along the loops; we obtained consistent values from imaging and spectral data, supporting the whistler origin of the fiber emission. The fibers in absorption and in emission are very similar as manifestations of the same wave train.
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