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Listing of Poster Abstracts
Early Reversal of the Sun's Polar Magnetic Fields and Assymetirc Sun as Observed with Hinode
Saku Tsuneta (National Astronomical Observatory of Japan)
We have been monitoring yearly variation of the Sun s polar magnetic fields with the Solar Optical Telescope aboard Hinode (Tsuneta+08, Ito+10, Shiota+12). The large magnetic flux concentrations with magnetic flux larger than 10(18) Mx per concentration have the same polarity, while the positive and negative fluxes are well balanced for more obscured flux concentrations with smaller magnetic flux (10(15)-10(16) Mx per concentration). The polarity of the polar region as a whole is determined only by such large magnetic concentrations. The decrease in the net magnetic fluxes of the both regions started in the declining phase of the previous cycle. The decrease is much more rapid in the North than in the South. The rapid decrease of the positive flux in the North region is due to the decrease in the number of the large flux concentrations. In contrast, the obscured concentrations for both polarities and that of the horizontal magnetic fields (Ishikawa+11) do not change during the year of 2008-2012. The Sun will have a dominant quadruple mode from the usual bipolar mode as the Sun in the Maunder minimum was speculated to have.
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