Sunspot: Difference between revisions

Latest revision as of 10:33, 1 October 2018

sunspot

An area seen as a dark spot in contrast with the surrounding photosphere of the sun. They form because of concentrations of emergent magnetic flux that can be unipolar, bipolar, or complex groups with mixed polarities. They appear dark because they are cooler than the surrounding photosphere. Sunspots go through stages of development, often emerging as pores (small immature spots). As they mature, they can grow extensively in size, become more pronounced, and grow far greater in number, becoming a sunspot group. A sunspot's dark center is called the umbra, and more mature groups develop a surrounding area of less dark or lighter-shaded areas called the penumbra. They have lifetimes from hours to several months, and vary in occurrence and number with the solar cycle.

Space Weather Prediction Center, 2018: Sunspots/solar cycle. Accessed 1 October 2018. Available at https://www.swpc.noaa.gov/phenomena/sunspotssolar-cycle.

Term edited 1 October 2018.

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    <div class="term">
 == sunspot ==
-  </div>
-<div class="definition"><div class="short_definition">A relatively dark area on the surface of the sun consisting of a dark central umbra surrounded  by a penumbra, which is intermediate in [[brightness]] between the umbra and the surrounding  [[photosphere]].</div><br/> <div class="paragraph">Sunspots are often nearly circular with a typical dimension of 20 000 km. The strongest solar  magnetic fields, up to 4000 gauss, are found within the umbra. Sunspots usually occur in pairs  with opposite magnetic polarities. They have a lifetime ranging from a few days to several months.  Their occurrence exhibits approximately an 11-year [[period]] (the [[sunspot cycle]]). <br/>''See'' [[relative  sunspot number]].</div><br/> </div>
+<div class="definition"><div class="short_definition">An area seen as a dark spot in contrast with the surrounding [[photosphere]] of the sun. They form because of concentrations of emergent magnetic flux that can be unipolar, bipolar, or complex groups with mixed polarities. They appear dark because they are cooler than the surrounding photosphere. Sunspots go through stages of development, often emerging as pores (small immature spots). As they mature, they can grow extensively in size, become more pronounced, and grow far greater in number, becoming a sunspot group. A sunspot's dark center is called the umbra, and more mature groups develop a surrounding area of less dark or lighter-shaded areas called the penumbra. They have lifetimes from hours to several months, and vary in occurrence and number with the [[solar cycle]].</div><br/> </div>
-</div>
+<p>Space Weather Prediction Center, 2018: Sunspots/solar cycle. Accessed 1 October 2018. Available at <nowiki>https://www.swpc.noaa.gov/phenomena/sunspotssolar-cycle</nowiki>.</p><br/>
+<p>''Term edited 1 October 2018.''</p>
 {{TermIndex}}