Jisho

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りゅうじょうはん 粒状斑
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Noun
1. granule​Astronomy
Wikipedia definition
2. Granule (solar physics)​Granules on the photosphere of the Sun are caused by convection currents of plasma within the Sun's convective zone. The grainy appearance of the solar photosphere is produced by the tops of these convective cells and is called granulation. The rising part of the granules is located in the center where the plasma is hotter. The outer edge of the granules is darker due to the cooler descending plasma.
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