NASA - Explore the Ionosphere (from the safety of your own home): "Above: A screen-shot of the 4D ionosphere. Clicking on the image launches a 19 MB video demo. You can download and launch your own 4D ionosphere by following these simple instructions.
The ionosphere is, in a sense, our planet's final frontier. It is the last wisp of Earth's atmosphere that astronauts leave behind when they enter space. The realm of the ionosphere stretches from 50 to 500 miles above Earth's surface where the atmosphere thins to near-vacuum and exposes itself to the fury of the sun. Solar ultraviolet radiation breaks apart molecules and atoms creating a globe-straddling haze of electrons and ions."
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