Solar cycle 7

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Solar cycle 7
Sunspot data
Start dateMay 1823
End dateNovember 1833
Duration (years)10.5
Max count119.2
Max count monthNovember 1829
Min count0.2
Cycle chronology
Previous cycleSolar cycle 6 (1810–1823)
Next cycleSolar cycle 8 (1833–1843)
Heinrich Schwabe, who discovered the sunspot cycle, began his personal observations in 1826, during solar cycle 7.[1]

Solar cycle 7 was the seventh solar cycle since 1755, when extensive recording of solar sunspot activity began.[2][3] The solar cycle lasted 10.5 years, beginning in May 1823 and ending in November 1833 (thus overlapping the Dalton Minimum). The maximum smoothed sunspot number (SIDC formula) observed during the solar cycle was 119.2 (November 1829), and the starting minimum was 0.2.[4]

See also[edit]


  1. ^ Excerpts from Solar Observations During 1843 by Heinrich Schwabe, (Astronomische Nachrichten, vol. 20., no. 495, 1843)
  2. ^ Kane, R.P. (2002), "Some Implications Using the Group Sunspot Number Reconstruction", Solar Physics, 205 (2): 383–401, Bibcode:2002SoPh..205..383K, doi:10.1023/A:1014296529097
  3. ^ "The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010.
  4. ^ SIDC Monthly Smoothed Sunspot Number. "[1]"