日地系统学中的太阳活动研究（Ⅰ）日地系统物理学中缓变型太阳活动的研究

STUDY OF SOLAR ACTIVITIES IN SOLARTERRESTRIAL SYSTEMATOLOGY (I):STUDY OF GRADUAL SOLAR ACTIVITIES

现代的日地物理学是把太阳－行星际空间－地球作为一个统一的体系，研究体系中各层次的动力学过程及各层次间的相互耦合作用。太阳活动是引起该系统变化和扰动的主要源，太阳活动的研究在日地物理研究中受到特别的重视。太阳活动现象依其变化速率可被分成缓变型与爆发型两类。本文叙述日地系统学中缓变型大阳活动的研究进展，并且讨论它在９０年代所面临的问题。

In the modem solar-terrestrial physics, the sun, earth and interplanetary space are treated as a whole system, and dynamic processes in every layer of the system and the inter-couplings between the layers are investigated. Solar activities as main sources of disturbances in the system may be divided into two groups: gradual activities and explosive activities. In this paper a review of the study of gradual solar activities including coronal holes, solar irradiance and sunspots is made and problems faced by the relevant study are discussed, for the investigation of the solar-terrestrial relationship.