Ulysses Recent Ascent to the South Polar Cap: Magnetic Field Observations

Details Ulysses Recent Ascent to the South Polar Cap: Magnetic Field Observations Ulysses Recent Ascent to the South Polar Cap: Magnetic Field Observations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh44a..05b&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH44A-05

Physics

2109 Discontinuities (7811), 2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2162 Solar Cycle Variations (7536), 2169 Solar Wind Sources

Scientific paper

By the time of this meeting, Ulysses will again be above the Sun's South Polar Cap at helio-latitudes above 70 degrees. The Ulysses observations are of special interest because of the reversal in polarity of the solar-heliospheric field, i.e., observations in the second half of the current Hale cycle and the on- going minimum in solar activity. The magnetic field investigation reveals that the last crossing of the heliospheric current sheet and entry into the unipolar positive sector occurred at the start of 2006 at a latitude of 35 degrees. Shortly afterward, the spacecraft crossed into the region dominated by fast solar wind and large amplitude Alfven waves. The polar cap solar wind is still exhibiting considerable structure in the magnetic field and polar solar wind flow in the form of enhancements in field strength and variations in velocity and density (microstreams). The large intermittent short period decreases in field magnitude, noted previously in the polar caps, are common. The current observations provide an opportunity to test whether or not r2 Br (the open magnetic flux) continues to be independent of latitude as found previously with important consequences for solar wind flow near the Sun. In addition, the measured field and open flux can be compared with estimates of the polar cap magnetic field strength, the area occupied by the polar coronal hole, the solar wind expansion factor and Source Surface models of the magnetic field.

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