Description: 在太阳的外层区域，炙热的气体流体上升、膨胀并冷却，随后下沉。这种对流过程发生在每个大约1500公里宽的独立单元内。每个单元中央升起的热物质比边缘下沉的冷物质更亮，因此形成了中心明亮、边缘较暗的图案，称为米粒。这些米粒是暂时的现象，每个米粒仅持续几分钟，随后便被太阳内部沸腾的对流气流所扰乱。

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The translation of this term and its definition is still awaiting approval

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