Magnetic cloud‐bow shock interaction: WIND and IMP‐8 observations
Magnetic cloud‐bow shock interaction: WIND and IMP‐8 observations
复制标题
磁云弓激波相互作用：WIND 和 IMP-8 观测
DOI：
10.1029/96gl01287
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发表时间：
1996
影响因子：
5.2
通讯作者：
J. Steinberg
中科院分区：
文献类型：
--
作者：
R. Lepping;A. Szabo;K. Ogilvie;R. Fitzenreiter;A. Lazarus;J. Steinberg
利用1995年2月8日的WIND磁场和等离子体观测资料，观测到一个直径为0.23 Au的行星际磁云，具有典型的磁绳结构。大约1小时后开始，在IMP 8处也观察到了这种现象，那里的弓形激波在黄昏侧距离地球至少39 RE，在云中短暂停留。这种膨胀的弓形激波在IMP-8从垂直型转变为脉动型，这是由于磁场在经过的云层中平滑地改变方向，并且它的表面法线在膨胀期间几乎是意外地不变的。据推测，在测量误差范围内，弓形激波的形状几乎“各向同性”地扩大，磁鞘变得异常宽。
An interplanetary magnetic cloud of typical magnetic field flux rope structure and of diameter 0.23 AU was observed in WIND magnetic field and plasma data of February 8, 1995. Starting at about 1 hour later it was also observed at IMP 8, where the bow shock reached at least 39 RE from Earth, on the dusk side, for brief periods within the cloud. This expanded bow shock changed from a perpendicular to pulsation type at IMP-8 as a result of the magnetic field smoothly changing direction within the passing cloud, and its surface normal was nearly, and unexpectedly, invariant during the expansion. It is inferred that, within measurement error, the bow shock's shape expanded almost ‘isotropicly’ and that the magnetosheath became unusually wide.