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Total Electron Content (TEC) is a measure of the total number of electrons in a vertical column of the ionosphere. It is indicative of the average electron density of the ionosphere. When there is increased ionisation caused by solar radiation, particularly when the Sun is very active, the average electron density of the sunlit area of the ionosphere increases, increasing the total number of electrons, or TEC. This has implications for HF radio communications, as well as GPS navigation and satellite communications. Total Electron Content itself does not directly effect humans, but it does effect us indirectly by effecting navigation and communication systems. Scientists also study TEC to understand how the ionosphere works and how it interacts with other regions of the near-Earth environment. TEC is not thought to significantly effect terrestrial weather systems. FYI:
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