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Hale Sector Boundaries.pdf - Leif and Vera Svalgaard's

Hale Sector Boundaries.pdf - Leif and Vera Svalgaard's

Hale Sector Boundaries.pdf - Leif and Vera Svalgaard's

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<strong>Hale</strong> <strong>Sector</strong> <strong>Boundaries</strong>Figure 3. Superposed epoch analysis of the average photospheric line-of-sight magnetic fieldfrom WSO keyed on sector boundaries that are <strong>Hale</strong> boundaries in the northern hemisphere,for solar cycle 21 (+,-) boundaries, 22 (-,+), <strong>and</strong> 23 (+,-). The number of boundaries (SB)<strong>and</strong> magnetograms (MG) used are as indicated. The left-h<strong>and</strong> panel shows the average signedfield, e.g. the sector structure in the photosphere. The right-h<strong>and</strong> panel shows the averagemagnitude of the field, confirming the original finding that the magnetic field is strongest atthe <strong>Hale</strong> portion of sector boundaries. Flux densities are color coded in µT.SOLA: <strong>Hale</strong>Bx.tex; 21 July 2010; 7:55; p. 5

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