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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >South Pole electric field responses to overhead ionospheric convection
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South Pole electric field responses to overhead ionospheric convection

机译：南极电场对电离层对流的响应

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Measurements of the vertical atmospheric electric field (E-z) at the South Pole between 1982 and 1986 have been analysed, and the results reveal an important component due to magnetospheric-ionospheric coupling processes. The results are consistent with the theoretical expectation that the ionospheric convection potential patterns in the polar caps, as measured by satellites, are superimposed on the otherwise nearly uniform (but varying in time) global ionospheric potential due to low-latitude thunderstorm sources. The analysis technique was to calculate the ionospheric convection potential from a satellite empirical model, using as input measured solar wind parameters, except that when solar wind data were not available we used as inputs measured ground based magnetic disturbance parameters. We fitted the average low-latitude E-z variation (the Carnegie curve) to the individually measured South Pole E-z diurnal curves. We then subtracted the fitted Carnegie curves from the measured curves and performed a regression analysis of the residual on the calculated ionospheric convection potential values, averaging the data in three hour intervals. Positive correlations with correlation coefficients of about 0.5 were found. Most of the remaining variability in E-z can be attributed to local meteorologically induced noise (especially in winter) and the day-to-day variability of the low-latitude thunderstorm generators. [References: 20]
机译：分析了1982年至1986年南极垂直大气电场（E-z）的测量，结果揭示了由于磁层-电离层耦合过程而产生的重要分量。结果与理论上的预期相符，即由于低纬度雷暴源，由卫星测得的极帽电离层对流势模式叠加在原本几乎均匀（但随时间变化）的全球电离层势上。分析技术是根据卫星经验模型，使用测量到的太阳风参数作为输入来计算电离层对流势，不同之处在于，当无法获得太阳风数据时，我们将基于地面的电磁干扰参数用作输入，以实测为基础。我们将平均低纬度E-z变化（卡内基曲线）拟合到单独测量的南极E-z日变化曲线上。然后，我们从测量的曲线中减去拟合的卡内基曲线，并对计算出的电离层对流电势值进行残差回归分析，以三个小时为间隔对数据进行平均。发现相关系数约为0.5的正相关。 E-z中大多数剩余的变异性可归因于当地气象诱发的噪声（特别是在冬季）和低纬度雷暴发生器的日常变异性。 [参考：20]

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