This image shows how different types of solar radiation (x-rays to infrared radiation) penetrate into the Earth's atmosphere. It is this solar radiation that ionizes the upper atmosphere, creating the ionosphere.
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Windows to the Universe original image
The Sun's Effect on the Ionosphere
is an invisible region found in the Earth's atmosphere
. When the Sun is more active
, the ionosphere is thicker.
So things like flares and coronal mass ejections will make the ionosphere thicker!
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