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Unformatted text preview: magnetic fieldhe magnetic fields remotely because of the Zeeman effect - the magnetic splitting of emission lines) we find that in one hemisphere all the "leading" spots of a pair tend to have the same polarity. What is more, the "leading" spots in the other hemisphere (ie the other side of the equator) tend to have the opposite polarity. In the following solar cycle, the polarities swap round. That is we have a situation like this: where the left hand diagram represents the situation in one solar cycle and the right hand diagram the situation in the next. Thus we can, in some senses talk of a solar cycle being 22 years rather than 11, since it takes that long for the polarities to go back to their original senses....
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