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: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
1999-05-01
|
| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/17/639/1999/angeo-17-639-1999.pdf |