暗条和日冕极紫外波的三维动力学演化研究  

Studies on Three-Dimensional Dynamic Evolution of Filaments and Coronal EUV Waves

作　　者：李婷[1] 

机构地区：[1]中国科学院国家天文台,北京100012

出　　处：《天文学报》2014年第1期101-103,共3页Acta Astronomica Sinica

摘　　要：探索三维空间内的各种太阳爆发活动是近年来人们普遍关注的一个热点课题．其主要原因在于爆发活动的三维演化反映了其真实的物理过程，对于认识各种活动现象的发生和演化规律十分重要．暗条爆发和曰冕物质抛射（CME）是两种重要的太阳活动现象．日冕极紫外（EUV）波是CME的一种伴生现象，对日冕EuV波的研究为完整地理解CME提供了重要的线索．由于先前的数据都来源于单一视角的观测，人们对暗条爆发和日冕EUv波的研究仅限于两维平面内，受到投影效应的影响．近年来，日地关系天文台（STEREO）和太阳动力学天文台（SDO）提供的多视角、高质量卫星数据为我们研究暗条爆发和日冕EUv波的三维演化提供了契机．In recent years, it becomes a popular topic to explore various solar eruptive activities in three-dimensional space. The main reason is that three-dimensional evolution of eruptive activities reflects their true physical processes, which is of great importance to understand the occurrence and evolution of various activities. Filament eruption and coronal mass ejection （CME） are two important solar activities. Coronal EUV wave is a phenomenon associated with CME, and the study of coronal EUV wave provides important clues for understanding CME entirely. Since previous observations are from one single viewpoint, the studies of filament eruption and coronal EUV wave are two-dimensional, and suffer from the projection effect. Recently, the multi-viewpoint and high-quality observations from the STEREO and SDO provide us a good opportunity to investigate the three-dimensional evolution of filament eruption and coronal EUV wave. We make full use of the advantages of current observations from STEREO and SDO, and study in detail the three-dimensional shape and evolution of filament eruption, the interaction of coronal EUV waves with coronal structures, and so on. The novel results of our study are listed as below. Using the two-viewpoint observations from the STEREO, we reconstruct two eruptive filaments, locate their positions in three-dimensional space, investigate their true dynamic evolution, and display the evolution of reconstructed filaments seen from different viewpoints with a new visualization method. For the first time, we analyze the true kinematic charac- teristics of different parts of the filament, and find that the highest part corresponds to the largest velocity during the early phase, which is implied to be the initially perturbed loca- tion; afterwards, other parts of the filament move the fastest, which should be accelerated by some mechanisms. With the increasing separation angle between the two STEREO satellites, the recon- struction becomes more difficult. The successful launch of the SDO prov

关 键 词：动力学演化 三维空间 极紫外 日冕 暗条 太阳爆发 活动现象 物理过程 

分 类 号：P15[天文地球—天文学]