Sunspot

Sunspots
Solar eclipse of October 23 2014 start of partial.jpgSunspots 1302 Sep 2011 by NASA.jpg
172197main NASA Flare Gband lg-withouttext.jpgSunspot TRACE.jpeg
Solar Archipelago - Flickr - NASA Goddard Photo and Video.jpg
  • Top: sunspot region 2192 during the partial solar eclipse in 2014 [1] and in September 2011.
  • Middle: sunspot close-up in the visible spectrum (left) and in UV, taken by the TRACE observatory.
  • Bottom: A large group of sunspots stretching about 320,000 km (200,000 mi) across.

Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic field flux that inhibit convection. Sunspots usually appear in pairs of opposite magnetic polarity. [2] Their number varies according to the approximately 11-year solar cycle.

Individual sunspots or groups of sunspots may last anywhere from a few days to a few months, but eventually decay. Sunspots expand and contract as they move across the surface of the Sun, with diameters ranging from 16 km (10 mi) [3] to 160,000 km (100,000 mi). [4] The larger variety are visible from Earth without the aid of a telescope. [5] They may travel at relative speeds, or proper motions, of a few hundred meters per second when they first emerge.

Indicating intense magnetic activity, sunspots accompany 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 other than the Sun are commonly called starspots, and both light and dark spots have been measured. [6]

Other Languages
Afrikaans: Sonvlek
العربية: كلفة شمسية
asturianu: Llurdiu solar
беларуская: Сонечныя плямы
български: Слънчево петно
bosanski: Sunčeve pjege
català: Taca solar
dansk: Solplet
Deutsch: Sonnenfleck
Ελληνικά: Ηλιακή κηλίδα
español: Mancha solar
Esperanto: Sunmakulo
euskara: Eguzki-orban
français: Tache solaire
Gaeilge: Grianspotaí
galego: Mancha solar
한국어: 흑점
हिन्दी: सौर कलंक
hrvatski: Sunčeve pjege
Bahasa Indonesia: Bintik matahari
italiano: Macchia solare
עברית: כתם שמש
ಕನ್ನಡ: ಸೌರಕಲೆ
Kreyòl ayisyen: Tach solè
Lëtzebuergesch: Sonnefleck
lietuvių: Saulės dėmė
Limburgs: Zonnevlek
la .lojban.: solri barna
magyar: Napfolt
македонски: Сончева дамка
Bahasa Melayu: Tompok matahari
монгол: Нарны толбо
Nederlands: Zonnevlek
日本語: 太陽黒点
norsk: Solflekk
norsk nynorsk: Solflekk
occitan: Taca solara
português: Mancha solar
română: Pată solară
Scots: Sunspot
Simple English: Sunspot
slovenčina: Slnečná škvrna
slovenščina: Sončeva pega
српски / srpski: Сунчеве пеге
srpskohrvatski / српскохрватски: Sunčeve pege
svenska: Solfläckar
тоҷикӣ: Доғи Офтоб
українська: Сонячні плями
Tiếng Việt: Vết đen Mặt Trời
中文: 太阳黑子