Periodicity records how regularly, or irregularly, a natural phenomenon actually recurs. Wikipedia notes auroras result from "disturbances in the Earth's magnetosphere caused by enhanced speeds of solar wind from coronal holes and coronal mass ejections," events tied to the Sun's own activity cycle rather than a fixed calendar. This dimension separates phenomena that recur on a predictable schedule from those that strike unpredictably.
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1. Wikipedia: Biogeochemical cycle
WikipediaBiogeochemical cycle, Fast and slow cycles section, fast-cycle sentence
Fast or biological cycles can complete within years, moving substances from atmosphere to biosphere, then back to the atmosphere.
Biogeochemical cycle, Fast and slow cycles section, slow-cycle sentence
Slow or geological cycles can take millions of years to complete, moving substances through the Earth's crust between rocks, soil, ocean and atmosphere.
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