Temporal-Spatial Variation of Global GPS-Derived Total Electron Content, 1999-2013.

PLoS One · 2015 · PMC4508092 · PMID 26193101

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a decreasing trendno p-value reported

an increasing trendno p-value reported

TECs over most regions present a decreasing trend during these 15 years based on the least squares spectral analysis, but the TEC over Greenland represents an increasing trend with 0.3 TECu annually, as shown in Fig 9 .

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