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Table 1. Summary Comparison of Sunspot Indices
| | Wolf
(R) | Zurich
(Rz) | International
(Ri) | American (Ra) |
| Spot Count Discipline | exclude small pores | count all | count all | count all |
| Group Multiplier | 10 | 10 | 10 | 10 |
| Standard Magnification | 64 | 64 | 64 | scan 1:40x-50x
scan 2:50x-70x
scan 3:80x-100x |
| "Reference Observer" | n/a | Wolf | Zurich
(Locarno) | SIDC |
| Scale factor to match Wolf (R) | n/a | 0.6 | 0.6 | n/a |
| Average k-coefficient | 1.0
assumed | 0.6 | .9
(varies) | 0.7
(varies) |
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