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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Electron hole structure and its stability depending on plasma magnetization
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Electron hole structure and its stability depending on plasma magnetization

机译：电子空穴结构及其稳定性取决于等离子体的磁化强度

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Observations from Polar have revealed that electron hole (e-hole) structure depends on the plasma magnetization determined by the ratio <()over bar> = Omega (e) /omega (pe), where Omega (e) and omega (pe) are the electron cyclotron and plasma frequencies, respectively. Using three-dimensional parallel particle-in-cell) simulations, we have studied the formation and structure of e-holes by varying <()over bar> showing that (1) for <()over bar> <1 e-holes are highly transitory while for <()over bar> > 1 long-lasting e-holes form, especially when <()over bar> greater than or equal to 2, (2) in the transitory e-holes for <()over bar> < 1, the e-holes are essentially planar with parallel electric fields E-parallel to > > E-perpendicular to, the perpendicular field, (3) when <()over bar> greater than or equal to 2 a variety of structures are possible ranging from spheroidal structures with E-x similar to E-y similar to E-parallel to to a planar one with E-x similar to E-y E-parallel to, where E-x and E-y are the x and y components of the perpendicular field E-perpendicular to. It is also possible that E-x < < E-y similar to E-parallel to. We find that e-holes with long transverse structures undergo a perpendicular modulation, which eventually breaks the long structures into fragments of e-holes. The fragments are seen to further decay by emitting lower hybrid (LH) waves. A linear model of these instabilities is developed showing an e-hole is an effective radiator of plasma waves. An e-hole with long transverse structure is effective in radiating high-frequency whistler waves which have long perpendicular wavelengths. When such waves are radiated out, the remnant structure is transversely modulated and has relatively short scale length. On the other hand, the fragments with the short perpendicular scale lengths are effective in radiating the LH waves. These findings from the simulations are compared with findings from the data from Polar [Franz et al., 2000]. [References: 25]
机译：Polar的观察表明，电子空穴（e-hole）的结构取决于等离子磁化强度，该比率由以下比率决定：<（<Ω> over bar> =Ω（e）/ omega（pe），其中，Ω（e）和omega （pe）分别是电子回旋加速器和等离子体的频率。使用三维平行单元中的粒子模拟，我们通过更改<（）over bar>来研究电子孔的形成和结构，结果表明（1）对于<（）over bar>当<（）over bar 1形成持久的电子孔时，<1个电子孔是高度瞬态的，尤其是当<（）over bar>大于或等于2时，（2）在<（）over bar> <1的瞬时电子孔中，电子孔基本上是平面的，平行电场E平行于 E垂直于垂直电场，（3）当<大于或等于2的（<Ω> over bar>）可能有多种结构，范围从具有类似于E的Ey类似于E-平行的球面结构，到具有类似于Ey的Ey与E平行的E平行的平面结构，其中Ex和Ey是垂直于E的垂直场的x和y分量。 E-x E-y类似于E-parallel也是可能的。我们发现具有长横结构的电子孔经历垂直调制，最终将长结构分解为电子孔的碎片。通过发射较低的杂化（LH）波，可以看到碎片进一步衰减。建立了这些不稳定性的线性模型，显示出电子空穴是等离子波的有效辐射体。具有长的横向结构的电子孔可有效地辐射具有长垂直波长的高频哨声波。当这些波辐射出去时，残余结构被横向调制并且具有相对短的标度长度。另一方面，具有短垂直标尺长度的碎片在辐射LH波方面是有效的。将模拟中的这些发现与Polar的数据中的发现进行比较[Franz等，2000]。 [参考：25]

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