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- Sunspot abstract "Sunspots are temporary phenomena on the photosphere of the Sun that appear visibly as dark spots compared to surrounding regions. They are caused by intense magnetic activity, which inhibits convection by an effect comparable to the eddy current brake, forming areas of reduced surface temperature. They usually appear as pairs, with each sunspot having the opposite magnetic pole to the other.Although they are at temperatures of roughly 3,000–4,500 K (2,700–4,200 °C), the contrast with the surrounding material at about 5,780 K (5,500 °C) leaves them clearly visible as dark spots, as the luminous intensity of a heated black body (closely approximated by the photosphere) is a function of temperature to the fourth power. If the sunspot were isolated from the surrounding photosphere it would be brighter than the Moon. Sunspots expand and contract as they move across the surface of the Sun and can be as small as 16 kilometers (10 mi) and as large as 160,000 kilometers (100,000 mi) in diameter, making the larger ones visible from Earth without the aid of a telescope.They may also travel at relative speeds ("proper motions") of a few hundred meters per second when they first emerge onto the solar photosphere.Manifesting intense magnetic activity, sunspots host secondary phenomena such as coronal loops (prominences) and reconnection events. Most solar flares and coronal mass ejections originate in magnetically active regions around visible sunspot groupings. Similar phenomena indirectly observed on stars are commonly called starspots and both light and dark spots have been measured.".
- Sunspot thumbnail Sun_projection_with_spotting-scope.jpg?width=300.
- Sunspot wikiPageExternalLink photosphere.
- Sunspot wikiPageExternalLink sunspot_swedish_c1.jpg.
- Sunspot wikiPageExternalLink Metadata.do?Portal=GCMD&KeywordPath=%5BParameters%3ACategory%3D%27EARTH+SCIENCE%27%2CTopic%3D%27SUN-EARTH+INTERACTIONS%27%2CTerm%3D%27SOLAR+ACTIVITY%27%2CVariable%3D%27SUNSPOTS%27%5D&OrigMetadataNode=GCMD&EntryId=FE00140&MetadataView=Brief&MetadataType=0&lbnode=gcmd3b.
- Sunspot wikiPageExternalLink Metadata.do?Portal=GCMD&KeywordPath=%5BParameters%3ACategory%3D%27EARTH+SCIENCE%27%2CTopic%3D%27SUN-EARTH+INTERACTIONS%27%2CTerm%3D%27SOLAR+ACTIVITY%27%2CVariable%3D%27SUNSPOTS%27%5D&OrigMetadataNode=GCMD&EntryId=NOAA_NCDC_PALEO_2005-015&MetadataView=Brief&MetadataType=0&lbnode=gcmd3b.
- Sunspot wikiPageExternalLink index.php3.
- Sunspot wikiPageExternalLink www.lmsal.com.
- Sunspot wikiPageExternalLink Ham_Radio_Toolbar.htm.
- Sunspot wikiPageExternalLink Propfire.htm.
- Sunspot wikiPageExternalLink solanki2004.
- Sunspot wikiPageExternalLink Astro-Solar-Sunspots.htm.
- Sunspot wikiPageExternalLink SolarCycle.
- Sunspot wikiPageExternalLink www.solarcycle24.com.
- Sunspot wikiPageExternalLink www.spaceweather.com.
- Sunspot wikiPageExternalLink www.suntrek.org.
- Sunspot wikiPageExternalLink sharpest_image_sunspot.html?6102005.
- Sunspot wikiPageID "27616".
- Sunspot wikiPageRevisionID "605578094".
- Sunspot align "left".
- Sunspot caption "1123200.0".
- Sunspot caption "A flare from sunspot NOAA 875.".
- Sunspot caption "Sunspot NOAA 875.".
- Sunspot caption "This movie plays a two-week long view of the Sun, sampled every hour, covering two weeks in the middle of February 2011. While the solar disk starts out featureless, eventually small groups of sunspots emerge, grow, and then rotate out of view.".
- Sunspot caption "This visualization tracks the emergence and evolution of a sunspot group as seen starting in early February 2011 and continuing for two weeks. Images are sampled one hour apart. The camera tracks the movement of the solar rotation. At this scale, a 'shimmer' of the solar surface is visible, created by the turnover of convection cells.".
- Sunspot direction "horizontal".
- Sunspot hasPhotoCollection Sunspot.
- Sunspot image "Growing Sunspots Tracking Closeup - February 2011.ogv".
- Sunspot image "NOAA 875 Flare.ogv".
- Sunspot image "NOAA 875.ogv".
- Sunspot image "Sunspot Growth in June 2012.ogg".
- Sunspot width "300".
- Sunspot subject Category:Solar_phenomena.
- Sunspot subject Category:Vortices.
- Sunspot comment "Sunspots are temporary phenomena on the photosphere of the Sun that appear visibly as dark spots compared to surrounding regions. They are caused by intense magnetic activity, which inhibits convection by an effect comparable to the eddy current brake, forming areas of reduced surface temperature.".
- Sunspot label "Macchia solare".
- Sunspot label "Mancha solar".
- Sunspot label "Mancha solar".
- Sunspot label "Plama słoneczna".
- Sunspot label "Sonnenfleck".
- Sunspot label "Sunspot".
- Sunspot label "Tache solaire".
- Sunspot label "Zonnevlek".
- Sunspot label "Солнечные пятна".
- Sunspot label "كلفة شمسية".
- Sunspot label "太阳黑子".
- Sunspot label "太陽黒点".
- Sunspot sameAs Sluneční_skvrna.
- Sunspot sameAs Sonnenfleck.
- Sunspot sameAs Ηλιακή_κηλίδα.
- Sunspot sameAs Mancha_solar.
- Sunspot sameAs Tache_solaire.
- Sunspot sameAs Bintik_matahari.
- Sunspot sameAs Macchia_solare.
- Sunspot sameAs 太陽黒点.
- Sunspot sameAs 흑점.
- Sunspot sameAs Zonnevlek.
- Sunspot sameAs Plama_słoneczna.
- Sunspot sameAs Mancha_solar.
- Sunspot sameAs m.06w8l.
- Sunspot sameAs Q6582994.
- Sunspot sameAs Q6582994.
- Sunspot wasDerivedFrom Sunspot?oldid=605578094.
- Sunspot depiction Sun_projection_with_spotting-scope.jpg.
- Sunspot isPrimaryTopicOf Sunspot.
