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Solar cycle 9
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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/List_of_solar_cycles/4Ywjmbel">List of solar cycles</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>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. S2CID 118144552. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010. <a href="http://www.spacetoday.org/SolSys/Sun/Sunspots.html" target="_blank">http://www.spacetoday.org/SolSys/Sun/Sunspots.html</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>SIDC Monthly Smoothed Sunspot Number. "[1]" <a href="http://sidc.oma.be/sunspot-data/" target="_blank">http://sidc.oma.be/sunspot-data/</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Spotless Days. "[2]" <a href="http://spaceweather.com/glossary/spotlessdays.htm?PHPSESSID=dli444kmrjgre0rjq6l86fv144" target="_blank">http://spaceweather.com/glossary/spotlessdays.htm?PHPSESSID=dli444kmrjgre0rjq6l86fv144</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Dr. Tony Phillips (11 July 2008). "What's Wrong with the Sun? (Nothing)". NASA. Archived from the original on 14 July 2008. <a href="https://web.archive.org/web/20080714032353/https://science.nasa.gov/headlines/y2008/11jul_solarcycleupdate.htm" target="_blank">https://web.archive.org/web/20080714032353/https://science.nasa.gov/headlines/y2008/11jul_solarcycleupdate.htm</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Solaemon's Spotless Days Page. "[3]" <a href="http://users.telenet.be/j.janssens/Spotless/Spotless.html" target="_blank">http://users.telenet.be/j.janssens/Spotless/Spotless.html</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Claudio Vita-Finzi. Solar History: An Introduction, p. 4, Springer, 2012 ISBN 9400742959. <a href="/wiki/Claudio_Vita-Finzi" target="_blank">/wiki/Claudio_Vita-Finzi</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Ronalds, B.F. (2016). Sir Francis Ronalds: Father of the Electric Telegraph. London: Imperial College Press. ISBN 978-1-78326-917-4. <a href="978-1-78326-917-4" target="_blank">978-1-78326-917-4</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Ronalds, B.F. (2016). "Sir Francis Ronalds and the Electric Telegraph". The International Journal for the History of Engineering & Technology. 86: 42–55. doi:10.1080/17581206.2015.1119481. S2CID 113256632. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>Nevanlinna, H.; Ketola, A.; Häkkinen, L.; Viljanen, A.; Ivory, K. (23 April 1993). "Geomagnetic activity during solar cycle 9 (1844–1856)". Geophysical Research Letters. 20 (8): 743–746. Bibcode:1993GeoRL..20..743N. doi:10.1029/93GL00836. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> </ol>