Possible evidence for partial demagnetization of electrons in the auroral E-region plasma during electron gas heating
Possible evidence for partial demagnetization of electrons in the auroral E-region plasma during electron gas heating
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电子气加热期间极光E区等离子体中电子部分退磁的可能证据
DOI：
10.1007/s00585-994-0040-5
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
C. Haldoupis
中科院分区：
文献类型：
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作者：
C. Haldoupis
先前的一项基于非相干和相干雷达测量的研究表明，在极光e区电子加热条件下，极光电喷流中的电子流相对于theE×Bdirection经历了系统的逆时针几度旋转。根据理论预测，在强驱动法利-布尼曼不稳定性期间，由增强的异常跨场扩散引起的e区电子退磁，观测证据在这里被重新检查。结果表明，观测结果与这一理论非常吻合。这显然支持了在极光电喷等离子体中电子气体强烈加热的情况下，波致扩散和异常电子碰撞频率以及因此产生的电子退磁的概念。然而，我们认识到，本报告中提出的电子退磁的证据不能被认为是确定的，因为它是基于一组有限的数据。因此，需要在这方面进行更多的实验研究。
A previous study, based on incoherent and coherent radar measurements, suggested that during auroral E-region electron heating conditions, the electron flow in the auroral electrojet undergoes a systematic counterclockwise rotation of several degrees relative to theE×Bdirection. The observational evidence is re-examined here in the light of theoretical predictions concerning E-region electron demagnetization caused by enhanced anomalous cross-field diffusion during strongly-driven Farley-Buneman instability. It is shown that the observations are in good agreement with this theory. This apparently endorses the concept of wave-induced diffusion and anomalous electron collision frequency, and consequently electron demagnetization, under circumstances of strong heating of the electron gas in the auroral electrojet plasma. We recognize, however, that the evidence for electron demagnetization presented in this report cannot be regarded as definitive because it is based on a limited set of data. More experimental research in this direction is thus needed.