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What ways can an astronomer determine when on 11 year old sunspot cycle ends and another begins?
Wiki User
∙ 14y ago
The sunspots in each cycle are of the opposite magnetic polarity. As the number of spots declines to near zero, we can tell when the new cycle has begun when new spots of the opposite polarity are appearing while no "old cycle" spots appear.
This has been a difficult transition; the sunspot number went to zero - and STAYED THERE, for nearly two years. Only since December 2009 can we really say that the Sun is becoming more active. The easiest way to track this is on the Web; visit www.spaceweather.com regularly.
Wiki User
∙ 14y ago
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