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首页> 外文期刊>Earth, planets and space: EPS >Scale factor mitigating non-compliance of double-frequency altimeter measurements of the ionospheric electron content over the oceans with GPS-TEC maps
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Scale factor mitigating non-compliance of double-frequency altimeter measurements of the ionospheric electron content over the oceans with GPS-TEC maps

机译：比例因子缓解了使用GPS-TEC地图对海洋电离层电子含量进行双频高度计测量的不合规性

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摘要

This paper presents results from a study of GPS total electron content (TEC) grid maps and ionospheric electron content (IEC) over the oceans delivered by the TOPEX/Jason satellites during half a solar cycle (July 2001 to December 2008). The IEC data are averaged and binned at latitudes from 60 degrees S to 60 degrees N in steps of 5 degrees +/- 2.5 degrees, at longitudes from 180 degrees W to 180 degrees E in steps of 15 degrees +/- 7.5 degrees, and for 0-23 h UT in steps of 1 +/- 0.5 h UT. The ratio of monthly averaged TEC/IEC over the oceans from the observations was compared to the reference model ratio of TECm/IECm obtained using the plasmaspheric model augmented with the International Reference Ionosphere. By definition, TEC should exceed IEC by the plasmaspheric electron content (PEC) contribution at the altitude range from 1336 km (TOPEX orbit) to 20,200 km (GPS orbit). However, as solar activity tends to the minimum, we found that IEC estimates systematically exceed those of GPS TEC. An empirical scale factor was derived in terms of the smoothed sunspot number, and this factor reduced the systematic excess of the TOPEX/Jason-derived IEC over the GPS TEC by a factor of 1.5 towards the solar minimum. This factor was tested with observations made at the solar minimum and revealed that the plasmaspheric electron content to be a residual of the GPS TEC and modified TOPEX/Jason IEC.
机译：本文介绍了TOPEX / Jason卫星在半个太阳周期（2001年7月至2008年12月）对海洋中GPS总电子含量（TEC）网格图和电离层电子含量（IEC）进行研究的结果。对IEC数据取平均值，并以5度+/- 2.5度的步长在纬度60度到60度N的范围内，以15度+/- 7.5度的经度从180度到180度的纬度进行平均和合并，并且UT 0-23小时，以1 +/- 0.5 h UT为步长。将观测到的海洋上月平均TEC / IECm的比率与使用国际参考电离层增强的等离子层模型获得的TECm / IECm的参考模型比率进行比较。根据定义，在1336 km（TOPEX轨道）到20,200 km（GPS轨道）的高度范围内，TEC的等离子层电子含量（PEC）贡献应超过IEC。但是，由于太阳活动趋于最小，我们发现IEC估计值系统地超过了GPS TEC的估计值。根据平滑的黑子数得出了经验比例因子，该因子将TOPEX / Jason派生的IEC相对于GPS TEC的系统过量降低了1.5倍，接近太阳极小值。通过在日照最小时进行的观察测试了该因子，发现等离子层电子含量是GPS TEC和改良的TOPEX / Jason IEC的残留量。

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