Table of contents: 1  Overview. 2  Detailed Reports Checklist. Statements Regarding Other IRS Filings and Tax Compliance. 3  Other organizations in North Carolina.  Affiliated organizations.
Answer: The amount of magnetic flux that rises up to the Sun's surface varies with time in a cycle called the solar cycle. This cycle lasts 11 years on average. This cycle is sometimes referred to as the sunspot cycle.
Plotting the total number of sunspots observed in a year reveals a pattern showing the number of sunspots in a cycle. The number of sunspots increase and decrease over an 11-year cycle, known as the sunspot cycle.