Hierdie lêer kom vanaf Wikimedia Commons en kan ook in ander projekte gebruik word.
Die beskrywing op die lêer se inligtingsblad word hieronder weergegee.
This graph image could be re-created using vector graphics as an SVG file. This has several advantages; see Commons:Media for cleanup for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with {{vector version available|new image name}}.
It is recommended to name the SVG file “Sunspot Numbers.svg”—then the template Vector version available (or Vva) does not need the new image name parameter.
Opsomming
This figure summarizes sunspot number observations. Since c. 1749, continuous monthly averages[dead link] of sunspot activity have been available and are shown here as reported by the Solar Influences Data Analysis Center, World Data Center for the Sunspot Index, at the Royal Observatory of Belgium. These figures are based on an average of measurements from many different observatories around the world. Prior to 1749, sporadic observations of sunspots are available. These were compiled and placed on consistent monthly framework by Hoyt & Schatten (1998a, 1998b).
The most prominent feature of this graph is the c. 11 year solar magnetic cycle which is associated with the natural waxing and waning of solar activity.
On longer time scales, the sun has shown considerable variability, including the long Maunder Minimum when almost no sunspots were observed, the less severe Dalton Minimum, and increased sunspot activity during the last fifty years, known as the Modern Maximum. The causes for these variations are not well understood, but because sunspots and associated faculae affect the brightness of the sun, solar luminosity is lower during periods of low sunspot activity. It is widely believed that the low solar activity during the Maunder Minimum may be among the principal causes of the chilly Little Ice Age, circa 1350-1850 A.D.
Copyright
This figure was prepared by Robert A. Rohde and is part of the Global Warming Art project.
Toestemming word verleen tot die kopiëring, verspreiding en/of wysiging van hierdie dokument onder die voorwaardes van die GNU-lisensie vir vrye dokumentasie, weergawe 1.2 of enige latere weergawe uitgegee deur die Stigting vir Vrye Sagteware, sonder Invariante Dele, geen Voorbladtekste en geen Agterbladtekste. 'n Kopie van hierdie lisensie is ingesluit in die afdeling getiteld GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
om te deel – die werk kopieer, versprei en deurgee
om te hermeng – om die werk aan te pas
Onder die volgende voorwaardes:
naamsvermelding – U moet die nodige krediet gee, 'n skakel na die lisensie verskaf en aandui of daar veranderinge aangebring is. U mag dit op enige redelike manier doen, maar nie op enige manier wat daarop dui dat die lisensiegewer u of u gebruik onderskryf nie.
insgelyks – As u die materiaal hermix, transformeer of voortbou, moet u u bydraes versprei onder die dieselfde of versoenbare lisensie as die oorspronklike.
This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue
References
Hoyt, D. V., and K. H. Schatten (1998a). "Group sunspot numbers: A new solar activity reconstruction. Part 1.". Solar Physics179: 189-219.
Hoyt, D. V., and K. H. Schatten (1998b). "Group sunspot numbers: A new solar activity reconstruction. Part 2.". Solar Physics181: 491-512.
I added another decade to the graph (through Oct., 2015). I started with the previous version was uploaded in 2006. Because it was almost a decade old, it lacked Solar Cycle 24. So I started with that version, and pasted a properly-scaled version of h...
I added another decade to the graph (through Oct., 2015). I started with the previous version was uploaded in 2006. Because it was almost a decade old, it lacked Solar Cycle 24. So I started with that version, and pasted a properly-scaled version of h...