Abstract
view Abstract Citations (13) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS New Information on Solar Activity, 1779--1818, from Sir William Herschel's Unpublished Notebooks Hoyt, Douglas V. ; Schatten, Kenneth H. Abstract Herschel's observations are analyzed in order to determine the level of solar activity for solar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. Publication: The Astrophysical Journal Pub Date: January 1992 DOI: 10.1086/170879 Bibcode: 1992ApJ...384..361H Keywords: Solar Activity; Sunspots; Astronomical Observatories; Solar Cycles; Solar Physics; SUN: ACTIVITY; SUN: SUNSPOTS full text sources ADS |
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