Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh44a..04s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH44A-04
Other
7509 Corona, 7511 Coronal Holes, 7524 Magnetic Fields, 7529 Photosphere, 7554 X-Rays, Gamma Rays, And Neutrinos
Scientific paper
The telescopes aboard Hinode satellite showed new views in solar physics. One of new discoveries obtained by Hinode is the activities in the polar region of the sun. Savcheva et al. (2007) investigated the coronal hole around the south pole using the high-cadence X-ray images, and they found that the appearance of X-ray jets in the polar coronal holes occurs at very high frequency -- about 60 jets/day on average. The other of new results obtained by Hinode is the magnetic field measurements of the solar polar region with high accuracy. Tsuneta et al. (2008) found that many vertically-oriented magnetic flux tube with field strength as strong as 1--1.2 kG that are scattered in latitude between 70 -- 90. If the trumpet-like magnetic structures extend to interplanetary space, there is possibility that they are the guide field of X-ray jets, coronal plumes and fast-solar wind. Thus, in order to understand the polar phenomena, it is very important to investigate the relation between the magnetic field distribution and the coronal structures. We examined the co-alignment between the Stokes-V maps of Na, the Stokes-Q maps of Fe, the X-ray images and the EUV images of the north polar region. At the result, we found that most of the trumpet-like magnetic structures around the pole do not associate with the coronal structures. It suggests that the energy injection for the fast-solar wind is not taking place in the corona. The other finding from the co-alignment is that X-ray jets are produced by the emerging/canceling fluxes. It is same as the jets in the active regions. The existence of the emerging flux near the pole suggests that the magnetic fields around the pole are provided from not only the active regions but also the emerging fluxes near the pole.
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