Mathematics – Logic
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640002n&link_type=abstract
American Astronomical Society, AAS Meeting #216, #400.02; Bulletin of the American Astronomical Society, Vol. 41, p.855
Mathematics
Logic
Scientific paper
We report on our investigation of the supergranular structure in the polar regions of the Sun by local helioseismology. Supergranules represent large-scale convective cells: the horizontal spatial scale is about 30 Mm and the lifetime is about 1 day. They play important role in the magnetic flux transport and formation of the magnetic network. Recent helioseismological studies have found that the depth of the cells is much smaller than the horizontal scale, and that the supergranulation pattern exhibits a wave-like behavior. However, we still do not have sufficient knowledge of the origin and properties of the supergranulation. In this work, we have carried out a new time-distance helioseismology analysis using high-resolution datasets of the polar regions of the Sun obtained by the Solar Optical Telescope (SOT) onboard the Hinode satellite during the periods of the high inclination of the solar axis to the ecliptic. Because of the foreshortening such measurements are not currently possible with any other helioseismology instrument. We have measured the travel-time shifts of acoustic waves traveling to various depth below the photosphere, and obtain the subphotospheric horizontal flow maps by inversion. We have detected the supergranular cells in the polar regions and studied their properties. For comparison we did a similar analysis for low-latitude regions at the East limb of the Sun, and at the disk center. Comparing with the cells in the lower-latitude regions, we have observed a curious alignment of the cells in the polar regions, approximately in the North-South direction. This `alignment' has been found in both the North and the South polar regions. In the presentation, we discuss the alignment phenomenon as well as the physical properties of the supergranular cells in the polar regions.
Kosovichev Alexander
Nagashima Kaori
Sekii Takashi
Zhao Jun
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