Which of the following makes the existence of ionosphere possible?(a) Rotation of the Earth(b) Ultraviolet radiation from sun(c) Solar flares(d) Radiation from distant starsThis question was posed to me in unit test.Query is from Atmospheric Effects on Satellite Signals in section Satellite Radio Navigation& Inertial Navigation of Avionics

Which of the following makes the existence of ionosphere possible?(a)

1.	Which of the following makes the existence of ionosphere possible?(a) Rotation of the Earth(b) Ultraviolet radiation from sun(c) Solar flares(d) Radiation from distant starsThis question was posed to me in unit test.Query is from Atmospheric Effects on Satellite Signals in section Satellite Radio Navigation& Inertial Navigation of Avionics
Answer» RIGHT option is (b) Ultraviolet RADIATION from sun For explanation I would say: The ionosphere owes its existence to the ultraviolet radiation from the sun. The photons possess a certain amount of ENERGY which is enough to break down electrons from their PARENT atom. The result is a large number of free, negatively charged, electrons and positively charged atoms and molecules called ions.

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