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Reference.org
Sprite (lightning)
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<p>Sprites or red sprites are large-scale <a href="/facts/Electric_discharge/06wCdIrV">electric discharges</a> that occur in the <a href="/facts/Mesosphere/JBPKmMuk">mesosphere</a>, high above <a href="/facts/Thunderstorm/F6hUzuAu">thunderstorm</a> clouds, or <a href="/facts/Cumulonimbus/DPWNqTDE">cumulonimbus</a>, giving rise to a varied range of visual shapes flickering in the night sky. They are usually triggered by the discharges of <a href="/facts/Positive_lightning/dLTuxz8n">positive lightning</a> between an underlying <a href="/facts/Thundercloud/DPWNqTDE">thundercloud</a> and the ground. </p>