Article ID Journal Published Year Pages File Type
10704030 Journal of Atmospheric and Solar-Terrestrial Physics 2005 14 Pages PDF
Abstract
The mean lifetime of sunspots is roughly estimated from the analysis of the Wolf number series. Ignoring obvious solar cycle related variations, we obtain rather constant life times for two long periods: 1848-1925, and again after 1950. The mean lifetime of sunspots grows by a factor 1.7 in the period 1925-1950, which would reveal an overall growth of solar activity.
Related Topics
Physical Sciences and Engineering Earth and Planetary Sciences Geophysics
Authors
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