[DOC] [TLE] Sunspot - Wikipedia [PAR] Sunspots are temporary phenomena on the photosphere of the Sun that appear 
as dark spots compared to surrounding regions. They are areas of reduced 
surface temperature caused by concentrations of ... Their number varies 
according to the approximately 11-year solar cycle. Individual sunspots may 
endure anywhere... [DOC] [TLE] StarChild: The Sun [PAR] The diameter of our closest star, the Sun, is 1,392,000 kilometers. ... Sunspots are 
magnetic storms on the photosphere which appear as dark areas. Sunspots 
regularly appear and disappear in eleven year cycles. ... Solar prominences are 
storms of gas which erupt from the surface in the form of columns which either 
shoot... [DOC] [TLE] The Sunspot Cycle - Emporia State University [PAR] Nov 28, 2011 ... Sunspots typically appear as a relatively small, dark and pore-like feature on ... 
This temperature difference gives the appearance of dark spots (cooler) on the 
sun's surface. .... Among these techniques, three are widely used and include: 1) 
... Disruptions in the regular 11-year sunspot cycle have occurred... [DOC] [TLE] Space Weather: Sunspots - Space.com [PAR] Feb 2, 2015 ... All of these fall under the definition of "space weather." ... Studying the surface of 
the sun can reveal small, dark areas that vary in number and location. ... As the 
solar cycle progresses, new sunspots appear closer to the equator, with the .... 
Perfect Lineup of Satellites Finds 'Missing Link' in Aurora Mystery... [DOC] [TLE] How the Sun's 11-Year Solar Cycle Works - Live Science [PAR] Jun 15, 2011 ... These short-lived patches are caused by intense magnetic activity and tend to ... 
dark spots on the solar surface act as indicators of the sun's activity as it ... As the 
sun reaches the end of a cycle, new sunspots appear near the ... a missing solar 
jet stream and the strength of the sun's magnetic field, show that... [DOC] [TLE] The booklet - ESA [PAR] The solar wind moves around these magnetic bubbles and interacts with them. 
.... They appear darker to the eye for the reason that their temperature is not as 
high as .... The spots appear and disappear on the Sun's surface in regular cycles
. [DOC] [TLE] Is the sun going dark? Latest Nasa images reveal TWO giant holes ... [PAR] Mar 17, 2015 ... Nasa has spotted a pair of huge 'holes' on the solar surface. ... March 16, 2015, 
which clearly shows two dark patches, known as coronal holes. ... The magnetic 
field in these regions extends far out into space rather than quickly ... places and 
with more frequency at different times of the sun's activity cycle. [DOC] [TLE] Chapter 16, Section 4 [PAR] 2.4) These dark areas are called sunspots. ... The spots appear dark because 
they are slightly cooler than the surrounding photosphere. ... The Sun's magnetic 
field lines emerge from the surface through one member of a pair and .... As can 
be seen, the 11-year periodicity of the solar sunspot cycle is far from regular. [DOC] [TLE] sun [PAR] When we see the sun, all we see is a big, round very bright object in the sky. In 
fact, it is ... Sunspots appear as dark spots on the sun's surface. ... This is the 
major cause of storms becoming worse during these times. ... When the solar 
cycle is at a minimum, active regions are small and rare and few solar flares are 
deected. [DOC] [TLE] Sunspots could soon disappear for decades: study - Phys.org [PAR] Sep 15, 2010 ... These areas are somewhat cooler than the surrounding sun surface and so 
appear to us as dark spots. ... least since the early 17th century, and they are 
known to follow an 11 year cycle from solar maximum to solar minimum. [DOC] [TLE] Popular Science Monthly/Volume 1/June 1872/The Spots on the Sun [PAR] Aug 26, 2015 ... surface disappears, and we see it irregularly sprinkled with dark points known as 
solar spots. These are, however, not always seen; sometimes the solar disk is ... 
Spots upon the sun's surface have been

Question: These dark patches on the sun's surface appear & disappear in regular cycles
Answer: sunspots