| 1. | The maximum usable frequency for skywave propagation is strongly influenced by sunspot number.
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| 2. | They also compared their predictions to average Sunspot numbers.
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| 3. | The mid-l930s were years with low sunspot numbers, and a severe drought created the Dust Bowl.
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| 4. | Wolf created a standard sunspot number index, the Wolf index, which continues to be used today.
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| 5. | Both measures agree reasonably with each other and with the Zurich sunspot number of the last two centuries.
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| 6. | He established a relative sunspot number formulation ( the Wolf or Z�rich sunspot number ) that became the standard measure.
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| 7. | He established a relative sunspot number formulation ( the Wolf or Z�rich sunspot number ) that became the standard measure.
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| 8. | :: " NASA Sunspot Number Predictions in March 2004 for Solar cycle 23 and 24, which did not come true.
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| 9. | May 1816 in particular had the lowest sunspot number ( 0.1 ) to date since record keeping on solar activity began.
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| 10. | Cycle 24's minimum occurred around December 2008 and the next maximum was predicted to reach a sunspot number of 90 around May 2013.
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