| タイトル | New information on solar activity, 1779-1818, from Sir William Herschel's unpublished notebooks |
| 著者（英） | Schatten, Kenneth H.; Hoyt, Douglas V. |
| 著者所属（英） | NASA Goddard Space Flight Center|Research and Data Systems, Inc. |
| 発行日 | 1992-01-01 |
| 言語 | eng |
| 内容記述 | 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. |
| NASA分類 | SOLAR PHYSICS |
| レポートNO | 92A19335 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/330332 |
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