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

Svalgaard et al.Figure 7. Schematic synoptic charts constructed by assuming a 4-sector structure and juxtaposingthe central 90 ◦ of four average magnetograms for alternating sector boundaries[(+,-)(-,+)(+,-)(-,+)] for solar cycles 21 through 23. The large-scale neutral line is sketchedusing the semi-transparent bars. The Hale-portion is marked with the brown bars. Ovals outlinethe flux concentrations of the signed solar sectors.Figure 8. As Figure 7, except showing the unsigned magnetic field. The red ovals drawattention to and confirm the finding (Svalgaard et al., 1975) that the field is at a maximum atthe Hale-portion of sector boundaries.SOLA: HaleBx.tex; 21 July 2010; 7:55; p. 10