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Survey of energetic O+ ions near the dayside mid-latitude magnetopause with Cluster

机译:团簇在日中纬度磁更年期附近的高能O +离子的调查

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摘要

Since December 2000, the Cluster satellites have beenconducting detailed measurements of the magnetospheric boundaries andhave confirmed the unambiguous presence of ions of terrestrial origin (e.g.O in regions adjacent to the dayside, mid-latitude magnetopause. Inthe present paper, we focus on the statistical properties of the O ioncomponent at energies ranging from 30eV up to 40keV, using three years ofion data at solar maximum from the Cluster Ion Spectrometry (CIS) experimentaboard two Cluster spacecraft. The O density decreases on average by afactor of 6, from 0.041 to 7x10cm when crossing themagnetopause from the magnetosphere to the magnetosheath, but depends onseveral parameters, such as the geomagnetic activity or the modifieddisturbed storm time index (*), and on their location. The Odensity is significantly higher in the dusk-side than in the dawn side region,which is consistent with the view that they originate mainly from the plasmasheet. A remarkable finding is that inward of the magnetopause, O isthe dominant contributor to the mass density 30% of the time on thedusk-side in comparison to 3% in the dawnside and 4% near noon. On an eventbasis in the dusk flank of the magnetopause, we point out that O ions,when dominating the mass composition, lower the threshold for generating theKelvin-Helmholtz instability, which may allow plasma exchange between themagnetosheath and the plasma sheet. We also discuss the effect of asubstantial O ion component when present in a reconnection region.
机译:自2000年12月以来,簇状卫星一直在进行磁层边界的详细测量,并确认了地源性离子的明确存在(例如,在靠近日间,中纬度磁层顶的区域中存在O。在本文中,我们着重研究能量是在30eV到40keV范围内的O离子成分,使用了两个簇集航天器上的簇离子光谱(CIS)实验获得的三年太阳最高离子数据,O密度平均降低了6倍,从0.041降低到7x10cm。从磁层到磁荒的磁通量,但取决于几个参数,例如地磁活动或修改后的扰动风暴时间指数(*)以及它们的位置。在黄昏时,密度比在黎明时高得多,这与它们主要来自血浆片的观点是一致的。一个显着的发现是向内在磁致发停的30%时间中,O是占黄昏时质量密度的主要贡献者,而黎明时为3%,正午时为4%。基于磁致绝经的黄昏侧面的一个事件,我们指出,当O离子控制质量组成时,会降低产生开尔文-亥姆霍兹不稳定性的阈值,这可能会使它们在鞘管和血浆片之间发生等离子体交换。我们还讨论了在重新连接区域中存在大量O离子成分的影响。

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