| 11. | Solar cycle # 8 ended in 1843, the year that Heinrich Schwabe discovered the sunspot cycle.
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| 12. | The journal based its prediction on sunspot cycles.
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| 13. | Satellite measurements show some small variations, less than 0.1 percent, in concert with the 11-year sunspot cycle.
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| 14. | Solar flares come in 11-year sunspot cycles, and we are approaching a maximum period in the year 2000.
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| 15. | The activity of the Sun is associated with the sunspot cycle, with more radiation occurring with more sunspots.
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| 16. | Changing radio propagation for long-distance communications due to the 11-year sunspot cycle is a factor at these frequencies.
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| 17. | It's a natural part of the sunspot cycle, discovered by German astronomer Heinrich Schwabe in the mid-19th century.
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| 18. | Satellite measurements show some small variations, less than 0 . 1 percent, in concert with the 11-year sunspot cycle.
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| 19. | "Research work regarding the role of meridional flows in the Sun's interior in setting the period of the sunspot cycle.
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| 20. | In these studies he showed that a dominant component was a cosine term of period equal to four sunspot cycles.
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