What is the cycle of sunspots?

Answer 1

Sun spots are cooler areas on the visible surface called pohotosphere..They appear in regular cycles.
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It is the variations in magnetic activity that cause them to appear in 11-year cycles. After 17 years of observations, S. H. Schwabe made the discovery in 1843.

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Answer 2

Christopher Ales

The sunspot cycle is approximately 11 years long and follows a pattern of increasing and decreasing sunspot activity. It involves a shift from solar maximum (high sunspot count) to solar minimum (low sunspot count) and back to maximum.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.