Sun 

SDO Solar Comparison October 2010 to October 2012

The sun goes through a natural solar cycle approximately every 11 years. The cycle is marked by the increase and decrease of sunspots — visible as dark blemishes on the sun's surface, or photosphere. The greatest number of sunspots in any given solar cycle is designated as "solar maximum." The lowest number is "solar minimum."

The solar cycle provides more than just increased sunspots, however. In the sun's atmosphere, or corona, bright active regions appear, which are rooted in the lower sunspots. Scientists track the active regions since they are often the origin of eruptions on the sun such as solar flares or coronal mass ejections.

The most recent solar minimum occurred in 2008, and the sun began to ramp up in January 2010, with an M-class flare (a flare that is 10 times less powerful than the largest flares, labeled X-class). The sun has continued to get more active, with the next solar maximum predicted for 2013.

The journey toward solar maximum is evident in current images of the sun, showing a marked difference from those of 2010, with bright active regions dotted around the star.


For More Information

http://www.nasa.gov/mission_pages/sunearth/news/solarmin-max.html


Credits

Scott Wiessinger (USRA): Animator
Scott Wiessinger (USRA): Producer
Karen Fox (ASI): Writer
Please give credit for this item to:
NASA's Goddard Space Flight Center/SDO

Short URL to share this page:
http://svs.gsfc.nasa.gov/goto?11072

Mission:
SDO

Data Used:
SDO
SDO/AIA/171 Filter

This item is part of these series:
SDO - Footage
Solar Snapshots

Keywords:
SVS >> Solar Cycle
SVS >> Solar Ultraviolet
SVS >> Solar Wind
SVS >> Sun
GCMD >> Earth Science >> Sun-earth Interactions
SVS >> Space Weather
SVS >> SDO
SVS >> Solar Dynamics Observatory
SVS >> Heliophysics
SVS >> Corona
NASA Science >> Sun

GCMD keywords can be found on the Internet with the following citation: Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 8.0.0.0.0