A straightforward estimation of the maximum sunspot number for cycle 23
Using the annual number of geomagnetically quiet days (<i>aa</i> < 20 γ) for the year <i>after</i> the solar minimum, this precursor method predicts that the maximum sunspot number for cycle 23 will be 140 ± 32, indicating that cycle 23 will be similar to cycles 21...
Main Authors: | , |
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Format: | Article |
Language: | English |
Published: |
Copernicus Publications
1999-05-01
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Series: | Annales Geophysicae |
Online Access: | https://www.ann-geophys.net/17/639/1999/angeo-17-639-1999.pdf |