A STUDY ON THE Bs EVENTS IN INTERPLANETARY SPACE AND THE ASSOCIATED CMEs IN 2000
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摘要: 根据WIND飞船的观测资料,讨论了2000年发生的南向磁场(Bs)事件,分析了它们的源,发现12次事件中有11次的源是日冕物质抛射(CME).运用从地球向太阳时间倒推的方法和LASCO,EIT195 Å的观测资料,确定了这些CME.它们都是快速CME,伴有行星际激波,都具有晕状(Halo)形态.它们在日面上发生的位置是在一个不对称的区域内.还分析了其中5个强南向磁场(Bs≥20nT)事件,发现它们的CME源,或者具有很高的能量,或者抛射方向正对地球,或者是具有叠加效应的CME系列.分析表明,在我们所讨论的太阳活动高年,大的行星际扰动和强地磁暴与高速流的联系并不密切.Abstract: According to the observations from WIND spacecraft, the events of southward magnetic field (Bs events) occurred in 2000 are studied. Among these 12 events, there were 11 events associated with the coronal mass ejections (CMEs). Using the data from WIND, SOHO/LASCO, and SOHO/EIT, we identified the associated CMEs, which were all halo type. All of these CMEs were moving outward with fast speeds and caused shocks ahead. The initial sites of these CMEs on the solar disc were in an asymmetrical region. By studing 5 strong Bs events (Bs ≥ 20 nT), it is found that the energy of the associated CMEs was high, or the associated CMEs just directed to the Earth, or there were several CMEs, which caused one same Bs event combinationally. In addition, during the solar maximum, the relationship between the intense disturbances in interplanetary space and the high-speed streams seem to be weak.
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Key words:
- CME /
- Magnetic cloud /
- Geomagnetic storm /
- High-speed stream
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