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首先分析了1998年11月7～8日的太阳风特性,分析结果显示,日地连线引力平衡点的ACE卫星在11月7日07:33UT观测到一个激波(以下简称第一个激波),从激波开始到11月7日22:00UT为激波之后的鞘区,随后在11月7日22:00UT至11月8日11:50UT之间观测到一个类磁云(MCL)物质,其中在11月8日04:19UT观测到另一个激波(以下简称第二个激波),第二个激波显然进入到类磁云的后半部分,类磁云前半部分未受第二个激波的影响.通过对1998年11月7～8日磁暴参数SYM-H的分析,我们把磁暴的主相分为3个阶段.第一阶段为从磁暴的急始11月7日08:15UT到11月7日22:44UT;第二个阶段为从11月22:44UT至11月8日04:51UT;第三阶段为从11月8日04:51UT至11月8日06:21UT,其中第二阶段对整个磁暴主相的发展起关键作用.通过对11月7～8日太阳风特性的分析,我们得到磁暴主相三阶段的行星际源分别为11月7日07:33UT开始的鞘区、11月7日22:00UT至11月8日04:19UT和之间的类磁云前半部分和从11月8日04:19UT至11月8日05:57UT之间的激波压缩类磁云后半部分,其中类磁云的前半部分具有持续时间较强的行星际磁场南向分量,它对这次磁暴主相的发展起着决定性的作用.第二个激波压缩类磁云后半部分对磁暴主相发展的贡献远低于类磁云前半部分对磁暴主相的贡献.
First, the solar wind characteristics of November 7-8, 1998 are analyzed. The results show that ACE satellite observing a shock wave at 07:33 UT on November 7 (hereinafter referred to as the first shock wave ). From the start of the shock to the sheath region at 22:00 UT on November 7 after shock, a magnetic cloud-like (MCL) event was observed between 22:00 on November 7 and 11:50 UT on November 8, Material, in which another shock wave (hereinafter referred to as the second shock wave) is observed at 04:19 UTC on November 8, and the second shock wave obviously enters the latter half of the magnetoid cloud. The first half of the geomagnetic cloud is not affected by The impact of the second shock wave.Through the analysis of the storm parameters SYM-H from July 7 to 8, 1998, we divided the main phase of the storm into three phases: the first phase is from the beginning of the storm to November 7 Day 08:15 UT until November 7 22: 44UT; the second phase from November 22:44 UT to November 8 04:51 UT; the third phase from November 8 04:51 UT to November 8 06: 21UT, in which the second stage plays a key role in the development of the entire main phase of the storm.The analysis of the solar wind characteristics from November 7 to August 8 shows that the interphase sources of the three phases of the main phases of the storm are respectively 07.07 : Stroke area beginning with 33UT, November 7, 22: 00UT to 04:19 UTC on November 8 and the first half of the magnetic cloud between 04:09 UT on November 8 and 05:57 UT on November 8, The first half of the magnetic cloud has a long-lasting southward component of the interplanetary magnetic field, which plays a decisive role in the development of the main phase of the storm. The second half of the shock-compression magnetic cloud develops the main phase of the storm Is far below the contribution of the first half of the magnetic cloud to the main phase of the storm.