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Discovery of the Sunspot Cycle

#16a. Discovery of the Sunspot Cycle

(Files in red–history)

Index

16. The Sun

16H. Schwabe, 1843

16a. Schwabe paper

16b. Carrington, 1859

17. The Corona

18. Solar Wind

18A. Interplan. Field

18H.Solar Wind obs.

Excerpts from Solar Observations During 1843 by Heinrich Schwabe, (Astronomische Nachrichten, vol. 20., no. 495, 1843)

From my earlier observations, which I have reported every year in this journal, it appears that there is a certain periodicity in the appearance of sunspots and this theory seems more and more probable from the results of this year. ...I should like now to add a complete report of all my observations of sunspots up to the present, in which I have indicated the number of days of observation and the days when there were no spots to be seen, as well as the number of groups.

Year	No. of Clusters	Days when no Spots were observed	Observation Days
1826	118	22	277
1827	161	2	273
1828	225	0	282
1829	199	0	244
1830	190	1	217
1831	149	3	239
1832	84	49	270
1833	33	139	267
1834	51	120	273
1835	173	18	244
1836	272	0	200
1837	333	0	168
1838	282	0	202
1839	162	0	205
1840	152	3	263
1841	102	15	283
1842	68	64	307
1843	34	149	324

You can also find on the web a biography of Schwabe by the High Altitude Observatory in Boulder, Colorado.

Back to the Index Page

Timeline

Expanded timeline

Glossary

Author and Curator: Dr. David P. Stern
Mail to Dr.Stern: education("at" symbol)phy6.org

Co-author: Dr. Mauricio Peredo

Spanish translation by J. Méndez

Last updated 25 November 2001
Re-formatted 9-28-2004