Checked content




Español: Variaciones en el ciclo solar.

This picture depicts the last three solar cycles as measured in solar irradiance, sunspot numbers, solar flare activity, and 10.7 cm radio flux. Solar irradiance, i.e the direct solar power at the top of the Earth's atmosphere, is depicted as both a daily measurement and a moving annual average. All other data are depicted as the annual average value.

See w:solar variation for more information.


This image was created by Robert A. Rohde from the published data listed below and replaces an image created by William M. Connolley. It is part of the Global Warming Art project.

Image from Global Warming Art
This image is an original work created for Global Warming Art. Please refer to the image description page for more information.
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
  • share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.
This licensing tag was added to this file as part of the GFDL licensing update.

Data sources

  1. Irradiance:
  2. International sunspot number:
  3. Flare index:
  4. 10.7cm radio flux:


The following pages on Schools Wikipedia link to this image (list may be incomplete):


Wikipedia for Schools...

Wikipedia for Schools was collected by SOS Children. Thanks to SOS Childrens Villages, 62,000 children are enjoying a happy childhood, with a healthy, prosperous future ahead of them. Have you thought about sponsoring a child?