Image Details
Caption: Fig. 3.
Time variation of the Sun's lowest order, rms multipole strengths, evaluated (a) at the photosphere, (b) at r = 2.5 R☉. The dipole strength ⟨b1⟩ is indicated by the solid line, the quadrupole strength ⟨b2⟩ by the dashed line, and the octupole strength ⟨b3⟩ by the dotted line. The curves were derived using WSO photospheric field data for CR 1835–1913.
© 1997. The American Astronomical Society. All rights reserved. Printed in U.S.A.