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首页> 外文期刊>International Journal of Geosciences >The Pattern of By Deflections Produced from Field-Aligned Currents Earthward of the Activation Source in the Earth’s Magnetosphere
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The Pattern of By Deflections Produced from Field-Aligned Currents Earthward of the Activation Source in the Earth’s Magnetosphere

机译：地球磁层中激活源向地磁场定向电流产生的偏斜模式

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In this investigation effort, we eventually infer that the overall quadrapole pattern of By deflections, in the vicinity of a source in the Earth’s magnetotail, is most likely due to field aligned currents (FACs) and not to Hall currents associated with an X-type collisionless reconnection. This categorically expressed statement is based upon sufficient observational evidence tightly associated with our own suggested model and the preceded works of the same author. Using representative events measured by satellite, our main aim is to describe the nature of the fundamental mechanism determining the polarity of the By deflections associated with intense earthward ionplasma flows. A major finding is that we either observe magnetic flux rope (MFR) like structures (that is, entities having all the morphological features of ropes;?i.e., a dipolar signature of Bz occurring simultaneously with peaked By and Btotal deflections) or mere By deflections, however, the sign for all these (Bydeflections) is always determined by the satellite placement in north (positive) or south (negative) plasma sheet. Therefore, the MFR-like structures located earthward of the source are most likely pseudo-MFRs; there is neither a tubular topology nor an axial magnetic field, the By deflections are produced by FACs. According to the presented model, a fundamental concept is that both ions and electrons are simultaneously accelerated at the source site; in turn, the earthward streaming electrons (ions) form a bifurcated electron (ion) FAC just outside the electron diffusion region-EDR (IDR). In this way, inside the IDR (and earthward of the source) positive (negative) By deflections in north (south) plasma sheet (PS) are produced due to FACs, and not to (inward) Hall currents as in the context of an X-line. Moreover, the ions form an “ion jet” within the IDR, while just outside this region they produce positive (negative) By deflections in north (south) PS caused by ion FACs. The ion jet in the IDR is enveloped by the bifurcated electron FAC. Eventually, although the resulting pattern of By deflections, due to both electron and ion FACs, is apparently the same with that resulting from Hall currents (in the X-line model), the underlying natural processes are, however, radically different. Certainly, the dominant “spatial entity” within the IDR is the ion jet-current (and not the Hall-electron current). Additional implications of the ion jets are also discussed.
机译：在这项研究工作中，我们最终推断出，在地球磁尾的一个源附近，By偏转的整体四极模式很可能是由于磁场对准电流（FAC）引起的，而不是由与X型相关的霍尔电流引起的。无碰撞重新连接。这种明确表示的陈述是基于与我们自己的建议模型以及同一作者的先前作品紧密相关的充分观察证据。利用卫星测量的代表性事件，我们的主要目标是描述确定与强烈的地球离子流相关的By偏转极性的基本机制的性质。一个主要发现是，我们要么观察到类似磁通量绳（MFR）的结构（即具有绳的所有形态特征的实体;即Bz的偶极子特征同时出现峰值By和Btotal偏转），要么仅观测到By偏转。但是，所有这些（偏转）的符号始终取决于卫星在北（正）或南（负）等离子层中的位置。因此，位于源极接地的类MFR结构最有可能是伪MFR。由于既没有管状拓扑结构，也没有轴向磁场，因此By偏转是由FAC产生的。根据提出的模型，一个基本概念是离子和电子在源位置同时被加速。反过来，向地流电子（离子）恰好在电子扩散区-EDR（IDR）外部形成了一个分叉电子（离子）FAC。这样，在IDR内部（和源极向地），由于FAC，在北（南）等离子体片（PS）中会产生正（负）挠曲，而不是像在环境中那样产生（向内）霍尔电流。 X线。此外，离子在IDR内形成一个“离子束”，而在该区域的外部，它们由于离子FAC在北（南）PS中产生正（负）偏斜。 IDR中的离子束被分叉的电子FAC包围。最终，尽管由于电子和离子FAC所产生的By偏转的模式显然与霍尔电流（在X线模型中）所产生的By偏转的模式明显相同，但是其潜在的自然过程却截然不同。当然，IDR中占主导地位的“空间实体”是离子射流（而不是霍尔电子流）。还讨论了离子束的其他含义。

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