# Annual Sunspot Numbers

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram CDF Player or other Wolfram Language products.

Requires a Wolfram Notebook System

Edit on desktop, mobile and cloud with any Wolfram Language product.

The number of sunspots observed on the sun has an 11-year cycle. It is easy to see the regularity of the sunspot cycle by examining observations taken over many years. Besides the 11-year cycle, there is an 80- to 90-year Gleisberg Cycle. From 1640 to 1710, an unusually low number of sunspots were observed. This period is known as the Maunder minimum. It coincided with a period of colder-than-average temperatures in northern Europe called the Little Ice Age.

Contributed by: Jeff Bryant (April 2007)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

The sunspot data used in this Demonstration was obtained from the National Geophysical Data Center.

## Permanent Citation

"Annual Sunspot Numbers"

http://demonstrations.wolfram.com/AnnualSunspotNumbers/

Wolfram Demonstrations Project

Published: April 27 2007