太阳风流速的太阳磁纬变化——一个三维背景太阳风模式

本文在简述当前在太阳坐标系中分析太阳风观测,研究太阳风三维结构的现状和问题的基础上,提出了太阳风参量太阳磁纬变化的概念,即在新的太阳磁坐标系中组织太阳风观测资料,分析太阳风参量相对于行星际电流片（而不是相对于太阳赤道）的空间分布。我们已做的1974年飞船观测资料分析和1976年行星际闪烁观测资料分析表明:存在着一个一致的合理的太阳风流速太阳磁纬变化规律。由此本文进一步提出了一个太阳风参量随太阳磁纬变化的背景太阳风模式。这模式不同于以前的各种无结构背景风模式（低速、平均、高速等）。文章最后讨论了这一背景结构的可能成因。

HELIOMAGNETIC LATITUDE VARIATION OF SOLAR WIND FLOW SPEED--A BACKGROUND MODEL

The current state of research on three-dimensional structure in solar wind in the he-liospheric coordinate system is briefly reviewed. A new concept about the heliomagnetic latitude variation of the solar wind plasma properties and a method searching for the variation, namely searching for the spatial distribution of the solar wind with respect to an interplanetary current sheet in a heliomagnetic coordinate system, are proposed. It is found from the analysis of spacecraft in situ observations in 1974 and that of IPS observations in 1976 that there is a consistent, reasonable heliomagnetic latitude variation of the solar wind flow speed. Based on the analyses, a background model of the solar wind, which is different from both the low speed quiet model and the high speed structure -free model, is suggested. Finally the possible explanation for such a heliomagnetic latitude variation of the solar wind is discussed.