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| Pairs of hydrogen nuclei are forced together by pressure which forms helium. In the process, enormous amounts of energy are released. |
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| Clouds of electrically charged particles emitted from the sun's surface that take about 3 days to reach Earth. |
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| A magnetic field surrounding Earth that deflect solar winds from entering the Earth. |
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| Radiant energy made up of different wavelengths that solar radiation is a part of. |
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| The distance between corresponding points on any two successive waves. |
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| Radiation from the sun- shorter wavelengths- include ultraviolet, visible and shortwave infrared. |
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| Radiation from the Earth- longer wavelengths- includes thermal infrared (heat energy). |
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| Solar radiation that reaches a horizontal plane at Earth- applies to radiation arriving at Earth's atmosphere. |
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| Average insolation received at the thermopause when Earth is at its average distance from the sun. |
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