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![[Post New]](/templates/default/images/icon_minipost_new.gif) 25 Mar 2008 01:23:31 IST
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a) at great heights
i think its bcoz ionosphere is the uppermost layer in the atmosphere.
The F region or the Appleton layer has extreme ultraviolet (UV) (10-100 nm) solar radiationcapable of ionizing atomic oxygen too.
at lower heights, extent of ionization decrese
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