Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh21a0505z&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH21A-0505
Physics
2104 Cosmic Rays, 2134 Interplanetary Magnetic Fields, 2162 Solar Cycle Variations (7536), 2164 Solar Wind Plasma, 7524 Magnetic Fields
Scientific paper
The evidence of north-south asymmetries in the heliosphere has been recognized in the galactic cosmic ray flux in the heliosphere (Simpson et al., 1996) and in the long-term, near ecliptic solar wind speed (Ziegler and Mursula, 1998). The asymmetries has been suggested to be associated with the north-south offset of the heliospheric current sheet that was confirmed by the solar wind measurements from Wind during March 1995 and Ulysses' fast latitude scan during early 1995 (Crooker et al., 1997). By examining the distribution of magnetic polarities on the source surface obtained using WSO observations over 25 years and the potential field-source surface model, we find that: (1) Significant north-south offset of the heliospheric current sheet occurs around minimum solar activity; (2) the north-south offset largely follows the 22-year solar cycle; (3) The north-south offset is mainly caused by the north-south asymmetry of the magnetic flux in polar regions.
Hoeksema Jon Todd
Liu Ya-Ying
Sommers Jeneen
Zhao Xiaopeng
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