“periodic variation of corona”的概念、定义、翻译、参考文献-科学参考

单词	periodic variation of corona
释义	periodic variation of corona Encyclopedia 理学太阳物理学释 periodic variation of corona日冕周期变化日冕的形状同太阳活动周期有关：在相对黑子数极大时，日冕近于圆形；而在黑子数极小时则较扁，赤道区延伸较远，两极区延伸较近，且有羽状物。因此，日冕的形状也与黑子数一样，有11年的变化周期。
随便看	closed subbase closed subcomplex closed subfield closed subgroup closed submanifold closed subscheme closed subset closed subspace closed substructure closed subsystem closed subvariety closed surface closed surface integral closed syllable closed system closed system of elements closed system of functions closed system of hot water supply closed term closed timelike curve closed [time] path Green's function closed time path Green's function closed topological manifold closed topology closed trail

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