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Pressure enhancement associated with meridional flow in high-speed solar wind: possible evidence for an interplanetary magnetic flux rope

机译:与高速太阳风子午流相关的压力增强:行星际磁通量绳索的可能证据

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摘要

A sizable total-pressure (magnetic pressureplus kinetic pressure) enhancement was found within the high-speed wind streamobserved by Helios 2 in 1976 near 0.3 AU. The proton density and temperature andthe magnetic magnitude simultaneously increased for about 6 h. This pressurerise was associated with a comparatively large southward flow velocity component(with ≈ –100 km · s)and magnetic-field rotation. The pressure enhancement was associated withunusual features in the electron distribution function. It shows a wide angulardistribution of electron counting rates in the low-energy (57.8 eV) channel,while previous to the enhancement it exhibits a wide angular distribution ofelectron count rate in the high-energy (112, 221 and 309 eV) channels, perhapsindicating the mirroring of electrons in the converging field lines of thebackground magnetic field. These fluid and kinetic phenomena may be explained asresulting from an interplanetary magnetic flux rope which is not fully convectedby the flow but moves against the background wind towards the Sun.
机译:在1976年Helios 2观测到的0.3 AU附近的高速风流中发现了相当大的总压力(磁压加动压)增强。质子密度和温度以及磁强度同时增加了大约6小时。这种压力上升与相对较大的向南流速分量(≈–100 km·s)和磁场旋转有关。压力增强与电子分布函数中异常的特征有关。它显示了低能量(57.8 eV)通道中电子计数率的宽角度分布,而在增强之前,它显示了高能量(112、221和309 eV)通道中电子计数率的宽角度分布。电子在背景磁场的会聚磁力线上的镜像这些流体和动力学现象可能是由于行星际磁通量绳索引起的,该绳索并未完全对流,而是逆着背景风向太阳移动。

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