天文学进展Issue(3)：259-281,23.DOI:10.3969/j.issn.1000-8349.2014.03.01
日冕中EUV 波的研究进展
Progress of the Study on the Coronal EUV Waves
摘要
Abstract
Extreme Ultraviolet (EUV) waves are large-scale disturbances in the corona. They can pass through the whole solar disk in an hour at the speed of hundreds of kilometers per second. The EUV wave was first discovered by Thompson (1998) when the data from the EUV Imaging Telescope (EIT) were studied. So it was originally named EIT wave. It is now generally called EUV wave since its appearance and properties are not dependent on a specific instrument, and ‘EUV’ is more appropriate for describing one of its important physical features. The EUV wave usually has a bright broad relatively-diffuse circular wavefront followed by an expanding dimming region. The EUV wave is thought to be the counterpart of the chromospheric Moreton wave in the corona. However, very few observation including both phenomena has been reported. Moreover, observations showed that EUV waves have two components, a faster wave in front and a slower wave following. These all indicate that the EUV wave and the Moreton wave are not the same. Though having been studied for years, the physical nature and the driving mechanism of EUV waves still remain unclear. Solar flares and coronal mass ejections(CMEs) are the two candidates to drive EUV waves. Currently, both theoretical and observational studies suggested that the flare cannot cause EUV wave, while CME is more likely to drive the EUV wave. In addition, whether EUV waves are the wave or the pseudo-wave or the hybrid wave is still unknown. There are five possible mechanisms for explaining EUV waves: fast mode MHD waves, magnetic field lines successively stretching, successive reconnection, current shell, and slow mode wave or solitary wave. The prevailing scenario of explaining the observational charac-teristics of EUV waves is of the combination of the first two. Take advantage of the high resolution telescope, we are convinced that EUV waves possess two components, which is supported by many observational evidences. However there are still many unsolved problems, and we hope that we can solve them in the future by development of the numerical simulations and observations of high spatial resolution and high time cadence.关键词
EUV波/Moreton波/日冕物质抛射/耀斑/快模磁流体动力学波/慢模磁流体动力学波Key words
EUV wave/Moreton wave/CME/flare/fast mode MHD wave/solitary wave分类
天文与地球科学引用本文复制引用
岳群,林隽,张力,吴宁..日冕中EUV 波的研究进展[J].天文学进展,2014,(3):259-281,23.基金项目
973项目(2011CB811403,2013CBA01503)；国家基金项目(11273055,11333007)；中国科学院创新工程方向性项目(KJCX2-EW-T07) （2011CB811403,2013CBA01503）
