Our analysis presents an explanation of the Sun–Earth coupling mechanism during declining phase of a solar cycle, and how the dominant 13.5 and 27 day periods play roles in the coupling mechanism which led to intense terrestrial magnetic storms during this declining phase compared to the rising phase of a solar cycle. Moreover, it is observed that while the 27 day period gets strongly modulated in the rising phase, the 13.5 day period modulation is more prominent during the declining phase. It is suggested that out of the 27 and 13.5 day periods of Sun–Earth interaction, the preferred period of modulation happens to be the one which is more dominant for the less random or quieter system participating in the coupling. It is reported for the first time that the 13.5 day period is more prominent in the Sun–Earth interaction during the declining phase of a solar cycle, as it is the most dominant period of Earth’s magnetic system, which happens to be more persistent as a dynamical system and hence quieter or more receptive than the Sun.
(Sun:) solar wind – (Sun:) sunspots – (Sun:) solar-terrestrial relation – (Sun:) activity – methods: data analysis
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