Definition: In astrophysics, an ionosphere is a region of space where charged particles such as electrons and protons are more likely to be found. The ionosphere has a high concentration of charged particles, which can cause disturbances in the Earth's magnetic field, leading to auroras. The term "ionopause" refers to the point at which the ionosphere becomes too dense for the electrons and protons to freely move and form an electrically neutral plasma. This is typically found below the Earth's
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