| Ionosphere |
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| q | The ionosphere is an
electrified |
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| region within the upper |
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| atmosphere where large |
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| concentration of ions and free |
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| electrons exist. |
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| q | The ionosphere starts from
about |
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| 60km above Earth’s surface and |
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| extends upward to the top of the |
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| atmosphere. Most of the |
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| ionosphere is in the thermosphere. |
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| q | The ionosphere plays an important |
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| role in radio communication. |
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