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Radio Propagation


Solar X-rays:
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Geomagnetic field:
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D-Region Absorption
Prediction:
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Created by PA4RM

The world’s longest-lived satellite, AO-7, turned 45 years old this month. It was launched on November 15, 1974, from Vandenberg Air Force Base in California. After nearly 7 years of service, AO-7 was thought to have reached the end of its life in June 1981 due to battery failure, and a premature obituary appeared in the AMSAT Satellite Report.

In an interesting footnote, although AO-7 was thoug...

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