| 41. | The sunspot cluster could be active another eight days.
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| 42. | Researchers said the sunspot could persist for several days.
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| 43. | Sunspots erupt and fade in 11-year cycles.
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| 44. | Isolated from the surrounding photosphere a sunspot would be brighter than the Moon.
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| 45. | Sunspots are observed with land-based and Earth-orbiting solar telescopes.
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| 46. | Other " surface features " on the photosphere are solar flares and sunspots.
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| 47. | The " butterfly " signature of sunspots is clearly visible at low latitudes.
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| 48. | Another cause of sunspots may be solar jet stream " torsional oscillation ".
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| 49. | They also compared their predictions to average Sunspot numbers.
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| 50. | The maximum usable frequency for skywave propagation is strongly influenced by sunspot number.
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