predecessor activity

• 1. 前导活动: Predecessor Activity | Predecessor | vorige activiteit
• 2. 前导子活动率: predecessor activity

• 1.这个质子活动区的主要形态特点是前导大黑子A的半影纤维的顺时针旋涡结构。
  The main morphological feature of this proton active region is the clockwise spiral structure of the penumbral filaments of the large preceding spot "A".
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