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[[File:Sun920607.jpg|thumb|right|The Sun with some sunspots visible.]]
'''Solar cycle 4''' was the fourth [[solar cycle]] since 1755, when extensive recording of solar [[sunspot]] activity began.<ref name="Kane">Kane, R.P. (2002). "[http://www.springerlink.com/content/qtq52nl8vtq7w2t6/ Some Implications Using the Group Sunspot Number Reconstruction]". ''Solar Physics'' '''205(2)''', 383-401.</ref><ref name=SpaceToday>{{Cite web| title=The Sun: Did You Say the Sun Has Spots? | url=http://www.spacetoday.org/SolSys/Sun/Sunspots.html | publisher=Space Today Online | accessdate=12 August 2010}}</ref> The solar cycle lasted 13.7 years, beginning in September 1784 and ending in May 1798 (thus overlapping the [[Dalton Minimum]]). The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 141.1, and the minimum was 3.2.<ref name="SIDC Monthly Smoothed Sunspot Number">SIDC Monthly Smoothed Sunspot Number. "[http://sidc.oma.be/sunspot-data/]"</ref>
'''Solar cycle 4''' was the fourth [[solar cycle]] since 1755, when extensive recording of solar [[sunspot]] activity began.<ref name="Kane">Kane, R.P. (2002). "[http://www.springerlink.com/content/qtq52nl8vtq7w2t6/ Some Implications Using the Group Sunspot Number Reconstruction]". ''Solar Physics'' '''205(2)''', 383-401.</ref><ref name=SpaceToday>{{Cite web| title=The Sun: Did You Say the Sun Has Spots? | url=http://www.spacetoday.org/SolSys/Sun/Sunspots.html | publisher=Space Today Online | accessdate=12 August 2010}}</ref> The solar cycle lasted 13.7 years, beginning in September 1784 and ending in May 1798 (thus overlapping the [[Dalton Minimum]]). The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 141.1, and the minimum was 3.2.<ref name="SIDC Monthly Smoothed Sunspot Number">SIDC Monthly Smoothed Sunspot Number. "[http://sidc.oma.be/sunspot-data/]"</ref>


Revision as of 00:52, 12 August 2014

Solar cycle 4 was the fourth solar cycle since 1755, when extensive recording of solar sunspot activity began.[1][2] The solar cycle lasted 13.7 years, beginning in September 1784 and ending in May 1798 (thus overlapping the Dalton Minimum). The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 141.1, and the minimum was 3.2.[3]

There are some recent speculations that cycle 4, the longest solar cycle since 1755, was actually two cycles.[4][5]

See also

References

  1. ^ Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics 205(2), 383-401.
  2. ^ "The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010.
  3. ^ SIDC Monthly Smoothed Sunspot Number. "[1]"
  4. ^ Template:Cite DOI
  5. ^ "Centuries-old sketches solve sunspot mystery", New Scientist, 1 August 2009, p. 10.



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