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Sunspot — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Sunspot
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-07T22:35:23.460Z
SHA-256 of the archived text: e926bdd25227b2eb54950c99e9af3b037386dd9964c486a86715ee4080448578
Stable URL of this page: https://metraipolis.com/documento/dc_da9c8a047fdf

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Sunspot — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Sunspot (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_da9c8a047fdf (Metraipolis archive dc_da9c8a047fdf, sha256 e926bdd25227b2eb54950c99e9af3b037386dd9964c486a86715ee4080448578)

BibTeX

@misc{dcda9c8a047fdf,
  title = {Sunspot — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Sunspot},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_da9c8a047fdf; sha256 e926bdd25227b2eb54950c99e9af3b037386dd9964c486a86715ee4080448578},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Sunspot. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Sunspots are temporary spots on the Sun's surface that are darker than the surrounding area. They are regions of reduced surface temperature caused by concentrations of magnetic flux that inhibit convection. Sunspots appear within active regions, usually in pairs of opposite magnetic polarity. 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) to 160,000 km (100,000 mi). Larger sunspots can be visible from Earth without the aid of a telescope. 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 other active region phenomena such as coronal loops, prominences, and reconnection events. Most solar flares and coronal mass ejections originate in these 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.

Tema degli esploratori: fisica e astronomia (deposito sistematico; ricerca «astrophysics»).
Fonte: Wikipedia in inglese, voce «Sunspot» — https://en.wikipedia.org/wiki/Sunspot
Wikidata Q6582994 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q6582994
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Sunspot?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1377968172, consultata il 2026-10-07T22:13:45.108Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 7b493844349ff33cc8610acc3bf3ce2a8ebc28e25e1234b03f8ce6cb0ed38024