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Some statistical relationships between coronal holes and prominence in solar active cycle 21 are analysed.
分析了太阳活动21周冕洞和日珥之间的一些统计关系。
At first, a brief summary of new discoveries in solar flare physics made during the ascending phase and declining phase of the cycle 21 and their astrophysical implication are given.
首先对第21周活动峰年期间取得的一些重大发现和进展作了总结，指出了它们在太阳耀斑物理上的重要意义。
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