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.
Click on image for full size
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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