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STAIRCASE ION SIGNATURE OBSERVED BY CLUSTER IN THE MID-ALTITUDE POLAR CUSP

机译:中高空极群中团簇观察到的相离子特征

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We use the Cluster string of pearl configuration in the mid-altitude polar cusp to investigate temporal variations of ion precipitation in the polar cusp. On 7 Aug. 2004, Cluster 4 was moving poleward through the Northern cusp, followed by Cluster 1 about 3 min. later, Cluster 2 about 9 min. later and finally Cluster 3 about 18 min. later. The ACE spacecraft detected a Southward IMF turning before the cusp crossings and IMF-Bz stayed negative throughout. Cluster 4 observed a staircase ion dispersion with 2 steps, a high energy one around 1 keV at low latitude and a low energy one at higher latitude. C1 around 3 min. later did not observe the high energy step anymore but a partial dispersion with a low energy cut-off reaching 100 eV. About 18 min. later, C3 observed a full ion dispersion from a few keV down to around 50 eV. This event is discussed in terms of temporal evolution of newly reconnected field lines on the equatorward side of the cusp for southward IMF.
机译:我们使用中高度极尖的珍珠簇簇串来研究极尖上离子沉淀的时间变化。 2004年8月7日,第4组向北极移动,穿过北尖峰,随后第1组约3分钟。之后,群集2大约需要9分钟。稍后,最后是第3组,大约18分钟。后来。 ACE航天器在尖点交叉口之前检测到IMF向南转弯,并且IMF-Bz始终保持负值。聚类4观察到有两个阶梯的阶梯离子弥散,在低纬度时高能量大约在1 keV,在高纬度时低能量一个。 C1大约3分钟。后来不再观察到高能阶跃,而是观察到部分弥散,低能级截止达到100 eV。约18分钟后来,C3观察到了从几keV到约50 eV的完全离子分散。根据南IMF的尖点赤道侧新近重新连接的场线的时间演变来讨论此事件。

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