The Sun: A Very Short Introduction by Philip Judge

Author:Philip Judge [Judge, Philip]
Language: eng
Format: epub
Tags: A Very Short Introduction, Science
ISBN: 9780192569011
Google: RgjZDwAAQBAJ
Publisher: Oxford University Press
Published: 2020-04-22T23:00:00+00:00

• systematic spot emergence between -30 and 30 degrees latitude, within the ‘wings of the butterfly’ (Figure 18);

• leading and following spots are of opposite signs in each hemisphere (Hale’s polarity law);

• steady motion of diffuse magnetic fields from spots towards the poles, over a year or so;

• ‘cancellation’, or reversal of sign of pre-existing polar fields, following the poleward motion of follower sunspots emerging systematically closer to the poles (‘Joy’s law’);

• after eleven years, the entire pattern is repeated with polarities now all reversed.

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