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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:
X-Ray Flux values can be obtained here.
Satellite