近年来Yohkoh、SOHO和Ulysses等飞船的上天大大提高了日冕观测的范围和精度。如SOHO上的LASCO使 日冕可观测范围扩展到1.1～30 R_\odot并有分光能力；Ulysses则可以取得黄道面外各纬度处的太阳风实 地观测数据。这些资料为日冕物态研究提供了大量有用信息：Yohkoh的软X射线观测发现了大尺度冕环重 联的证据；LASCO与其他空间和地面仪器联测对CME的研究提供了极有价值的诊断信息；Ulysses在不到1yr 的时间内从太阳的一个极绕行至另一个极，所取得的实地太阳风观测资料可用于建立日球三维模型。
Recently the launches of a series of spacecrafts, such as Yohkoh, SOHO, Ulysses, etc., have greatly extended the observable range and improved the data. The LASCO/SOHO is a coronagraph which can be used to observe corona of large angle (1.1~ 30R_\odot) with spectrometric ability. Ulysses was planed to get in situ measurements of solar wind. Many useful information has been obtained from these instruments. Strong evidence for magnetic reconnection between the large scale coronal loops was reported from Yohkoh soft X-ray observations. Joint observations of the LASCO and some other space or groundbased instruments bring new insight and valuable diagnosis of the study of CME. Ulysses data present in situ measurements of both speed and electron density of solar wind as a function of heliolatitude during its pole-to-pole transit in less than one year, which is very useful for modeling a 3-D picture of heliosphere.