冕流波及其冕震学应用研究综述  

A review on streamer waves and associated coronal seismological study

作　　者：陈耀[1] 冯士伟[1] 宋红强[1] 李波[1] 孔祥良[1] 夏利东[1] 李醒 李刚[1,3] 

机构地区：[1]山东大学空间科学研究院,山东大学威海分校空间科学与物理学院,山东威海264209 [2]亚伯里斯威斯大学数学与物理研究所,英国威尔士 [3]阿拉巴马汉茨维尔大学物理系,空间等离子体与高层大气物理研究中心,美国阿拉巴马

出　　处：《山东大学学报（理学版）》2011年第10期66-74,共9页Journal of Shandong University(Natural Science)

基　　金：国家自然科学基金资助项目(40825014,40890162,40904047(李波),40974105(夏利东),41028004(李刚));高等学校全国优秀博士学位论文作者专项资金(2007B24);山东省自然科学基金资助项目(ZR2010DQ016(宋红强))

摘　　要：综述了我们近两年来在冕流波(Streamer Waves)现象研究方面的进展。冕流波是由日冕物质抛射(CME)和冕流结构相互作用所激发的、沿等离子体片向外传播的波动过程,是迄今发现的最大尺度的日冕波动现象。冕流波被解释为由冕流等离子体片片状结构所支持的快体积扭曲模式。基于这一理解,我们结合有关的太阳风速度和数密度方面的观测限制,发展了一种新的冕震学方法,可利用波动参数的观测结果推断冕流等离子体片区域在3-10太阳半径范围的阿尔芬速度和磁场强度的径向剖面。我们还在第23太阳活动周内找到了8例较好的CME-冕流摆动事件,其中5例被认定为冕流波事件。比较这些事件发现,导致冕流波激发的CME都具有很高的喷发速度和角宽度,CME与冕流大都从侧面发生相互作用,且作用的最初位置大都位于C2视场的底部或下方,所有正面CME均伴有耀斑现象。这些共同观测特征为我们理解冕流波的激发条件提供了线索。In this paper, we reviewed our latest studies on a newly-discovered phenomenon dubbed ＂streamer waves＂ which are excited in the aftermath of CME-streamer interaction. Streamer waves represent one of the largest wave phenomena ever observed in the solar corona. The wave mode is interpreted as the fast kink body mode supported by and propagating outwards along the plasma sheet of the streamer. With the white light coronagraph data and available obser- vational constraints on the solar wind parameters, we develop a novel seimological technique to diagnose the radial profiles of the Alfv6n speed and magnetic field strength in the region surrounding the plasma sheet structure from 3 to 10 solar radii. We also conduct a data survey searching for well-defined streamer wave events observed by the SOHO/LAS- CO coronagraph throughout Solar Cycle 23. As a result, eight candidate events were found. We compare different events and fred that in most of them the driving CMEs＇ ejecta were characterized by high speed and wide angular span, and the CME-streamer interactions generally occurred along the flank of the streamer structure at an altitude no higher than the bottom of the field of view of LASCO C2. In addition, all front-side CMEs had accompanying flares. These common observational features shed light on the excitation conditions of streamer wave events.

关 键 词：日冕 日冕物质抛射 冕流波 冕震学 

分 类 号：P354.3[天文地球—空间物理学] P353.7[天文地球—地球物理学]