New information on solar activity, 1779-1818, from Sir William Herschel's unpublished notebooks

Details New information on solar activity, 1779-1818, from Sir William Herschel's unpublished notebooks New information on solar activity, 1779-1818, from Sir William Herschel's unpublished notebooks

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384..361h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 384, Jan. 1, 1992, p. 361-384.

Astronomy and Astrophysics

Astrophysics

9

Solar Activity, Sunspots, Astronomical Observatories, Solar Cycles

Scientific paper

Herschel's observations are analyzed in order to determine the level of solar activity for solar cycle 5. It is concluded that solar cycle 5 may have peaked as early as 1801 based upon the average number of groups with a probable secondary maximum in 1804. Depending on the technique adopted, the peak for solar cycle 5 occurred sometime between 1801 and 1804, rather than 1805.2, as commonly assumed. Instead of a solar cycle of 17 yrs, a cycle length of 14 yrs is found. It is also found that the peak yearly mean sunspot number is only about 38 rather than 45, as deduced by Wolf (1855). A technique for making early solar observations homogeneous with modern sunspot observations is proposed.

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