Ham Amateur Radio Technician Practice Exam 2025 – The Complete All-in-One Guide to Exam Success

Question: 1 / 470

Approximately how long does it take the increased ultraviolet and X-ray radiation from a solar flare to affect radio propagation on Earth?

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8 minutes

The increased ultraviolet and X-ray radiation from a solar flare affects radio propagation on Earth within approximately 8 minutes. This is due to the nature of light and electromagnetic radiation traveling at the speed of light, which is about 300,000 kilometers per second. Solar flares release a burst of radiation that reaches Earth almost instantaneously, but the effects on the ionosphere, which is responsible for radio signal propagation, manifest a short while later.

It generally takes about 8 minutes for the radiation to directly influence the ionosphere and cause disruptions in radio communication. This is particularly relevant for radio operators, as they must be aware of these delays when monitoring solar activity and its potential impact on radio waves.

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