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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Statistical Relations Between Auroral Electrical Conductances and Field-Aligned Currents at High Latitudes
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Statistical Relations Between Auroral Electrical Conductances and Field-Aligned Currents at High Latitudes

机译：统计极光电之间的关系在高电导和Field-Aligned电流纬度

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摘要

Field-aligned currents from the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) were combined with simultaneous and coincident observations of ionospheric conductivities made by the Poker Flat Incoherent Scatter Radar (PFISR) in Alaska for 20 geomagnetically active days. The height-integrated conductivities (conductances) were determined from the electron densities measured by the radar between 80 and 200 km altitude. Binning and averaging the data by field-aligned current density and magnetic local time, we find that the currents correlate with conductances in both upward and downward current regions over some magnetic local times. The strongest correlation is seen in the late evening and morning sectors, with the Hall conductances two to three times larger than the Pedersen conductances for the same values of the field-aligned current. The observed correlations reflect the mean energy of auroral precipitation, the contributions from electrons and protons to producing enhanced conductances, and the availability of charge carriers on auroral field lines. We apply linear fitting and smoothing to the correlations to construct an empirical model for specifying auroral conductances globally from AMPERE field-aligned current maps. The energy fluxes from precipitating particles derived from the model conductances compare well with those derived using AMPERE data combined with satellite-based measurements of far ultraviolet emissions, suggesting the results obtained at Poker Flat may be applicable to all high latitude locations. The ability to estimate conductances from AMPERE field-aligned current maps provides the means to develop a global conductance model for the auroral ionosphere.
机译：Field-aligned洋流的活跃磁气圈和行星电动力学(安培)结合反应实验同步和一致的观察电离层导率由扑克持平非相干散射雷达(PFISR)在阿拉斯加为20眼睛活跃天。height-integrated导率(导)从电子密度测定通过测量雷达80至200公里高度。field-aligned电流密度和磁当地时间,我们发现电流与电导在向上和向下的电流在一些地区磁当地时间。强烈的相关性是在晚上和早上部门,霍尔电导比他大两到三倍电导的相同值field-aligned电流。反映了极光的能量平均降雨量,电子和质子的贡献生产提高电导,电荷载体在极光领域的可用性行。构建实证模型的相关性用于指定全球极光电导安培field-aligned当前地图。从沉淀颗粒来源于通量该模型与电导比较好使用安培数据结合派生而来卫星测量的远紫外线排放,暗示的结果扑克平可能适用于所有高纬度的位置。从目前安培field-aligned地图提供了开发一个全球性的电导模型的手段极光电离层。

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