Image:Sunspot with Earth Comparison.jpg

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Description

Active region 9393 as seen by the MDI instrument on SOHO hosted the largest sunspot group observed so far during the current solar cycle. On en:30 March en:2001, the sunspot area within the group spanned an area more than 13 times the entire surface of the Earth. It was the source of numerous flares and en:coronal mass ejections, including one of the largest flares recorded in 25 years on en:2 April en:2001. Caused by intense en:magnetic fields emerging from the interior, a sunspot appears to be dark only when contrasted against the rest of the solar surface, because it is slightly cooler than the unmarked regions.

Images courtesy of NASA. The author composited the images, added the annotation, and removed the date stamp from the inset.

Source

Originally from en.wikipedia; description page is/was here.

Date

2007-02-18 (first version); 2007-02-19 (last version)

Author

Original uploader was Greg L at en.wikipedia

Permission
(Reusing this image)

PD-LAYOUT; PD-USGOV-NASA.


[edit] License information

Public domain
This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy).

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[edit] Original upload log

(All user names refer to en.wikipedia)

  • 2007-02-19 21:33 Greg L 1150×324×8 (258064 bytes) Active region 9393 as seen by the MDI instrument on SOHO hosted the largest sunspot group observed so far during the current solar cycle. On [[30 March]] [[2001]], the sunspot area within the group spanned an area more than 13 times the entire surface of
  • 2007-02-18 22:32 Greg L 1150×324×8 (262391 bytes)

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actuel10 août 2007 à 00:211 150×324 (252 Kio)ToNToNi ({{Information |Description=Active region 9393 as seen by the MDI instrument on SOHO hosted the largest sunspot group observed so far during the current solar cycle. On en:30 March en:2001, the sunspot area within the group spanned an area more t)

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