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