The periodicity of solar activity is closely related to the orbits of the planets. When planets reach their perihelion, known as the 'black cycle,' they can have a significant impact on the Sun. Pluto, being one of the farthest planets from the Sun, has a 'black cycle' lasting 30 years, which notably affects solar activity. In 1989, when Pluto passed its perihelion, there was a dramatic increase in sunspot numbers, which not only impacted Earth's climate but also potentially led to a series of disasters, including volcanic eruptions, accelerated water cycles, and increased disease outbreaks.
Solar activity peaks are typically accompanied by surges in sunspot numbers, and this phenomenon often coincides with the 'black cycles' of specific planets. For instance, from 1979 to 2009, Pluto's 'black cycle' had a significant influence on solar activity. In 2039, Neptune is expected to approach the Sun, while Saturn and Jupiter will also experience their respective 'black cycles.' The intertwining activity cycles of these planets complicate the predictions of solar activity.
The periodic changes in solar activity have a profound impact on Earth. Solar eruptions can trigger volcanic activity, flooding disasters, and increase the incidence of epidemics, posing threats even to the safety of astronauts. Therefore, scientists are working diligently to observe and calculate these periodic changes to mitigate natural disasters on Earth.
