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Alternative TitleCase Study of Interaction Between Interplanetary Magnetic Cloud and Heliospheric Current Sheet
冯翔; 魏奉思; 冯学尚; fengg3@163.com
Source Publication空间科学学报
Keyword磁云 日球电流片 磁重联 碰撞
Abstract基于1995-2007年Wind飞船观测到的105个磁云事件,按照磁云在地球附近是否与日球电流片发生碰撞,将其分为碰撞和未碰撞两类,得到初步分析结果。①可能与日球电流片发生碰撞的磁云事件有51例,约占事件总数的49%;②发生碰撞时,磁云与日球电流片之间的相互作用区内呈现动力学相互作用增强的趋势,例如多呈现局部的磁场方向间断结构(或称局域电流片结构),伴随磁场强度下降、质子温度升高、部分质子速度分量出现跃变,Langmuir波或100~250 kHz的离子声波出现增强,这些现象可能与碰撞相互作用区域内发生的磁重联有关;没有碰撞时这些特征一般不明显;③至少有15个事例中,磁云前后背景磁场的极性相反,或磁场极性反转的位置位于磁云内部,显示磁云可能正在跨越电流片运动;④在几个磁云事件中发现磁云的亮环和亮核纤维结构。这些极为初步的分析结果有利于了解磁云与日球电流片之间的相互作用过程。
Other AbstractBased on 105 Magnetic Cloud (MC) events detected by WIND spacecraft from 1995 to 2007, according to whether the MC collided with the Heliospheric Current Sheet (HCS), the MC events are devided into two types, namely, colliding and non-colliding. The preliminary results are as follows. Firstly, there are 51 MCs which may have collided with the HCS, and that is about 49% of the total incident. Secondly, when a MC collided with the HCS, dynamic interactions tend to inhance in the region between magnetic cloud and heliospheric current sheet, such as appearance of local magnetic field directional discontinuity structures, decreased magnetic field strength, increased proton temperature, irrupt changes of some components of proton velocity, enhancement of ion- acoustic waves or Langmuir waves. These phenomena are possibly related to magnetic reconnection in the colliding interaction regions. In case of non-colliding, these characteristics are not evident. Thirdly, in at least 15 cases, the magnetic polarity of the background magnetic fields in front of the magnetic cloud and the one behind the magnetic cloud are opposite, or the reverse point of magnetic polarity was inside the magnetic cloud, which means the magnetic cloud was moving cross the HCS. Lastly, bright fronts and bright cores of MCs have been observed in some events. These very preliminary results are beneficial to understanding the process of interaction between magnetic cloud and the heliospheric current sheet, however further researches are still required.
Indexed ByCSCD
Funding Project中国科学院空间科学与应用研究中心
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Document Type期刊论文
Corresponding Authorfengg3@163.com
Recommended Citation
GB/T 7714
冯翔,魏奉思,冯学尚,等. 行星际磁云与日球电流片相互作用的实例分析[J]. 空间科学学报,2011,31(6):725-738.
APA 冯翔,魏奉思,冯学尚,&fengg3@163.com.(2011).行星际磁云与日球电流片相互作用的实例分析.空间科学学报,31(6),725-738.
MLA 冯翔,et al."行星际磁云与日球电流片相互作用的实例分析".空间科学学报 31.6(2011):725-738.
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