Magnetic Sectors of the Heliospheric Field as Observed by Ulysses Through Two Solar Cycles

Details Magnetic Sectors of the Heliospheric Field as Observed by Ulysses Through Two Solar Cycles Magnetic Sectors of the Heliospheric Field as Observed by Ulysses Through Two Solar Cycles

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh51a1596e&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH51A-1596

Physics

2134 Interplanetary Magnetic Fields, 2162 Solar Cycle Variations (7536)

Scientific paper

The nearly two solar cycles that Ulysses has spent in its polar orbit around the Sun has provided a data base of in situ measurements as a function of heliographic latitude. The polarity of the magnetic field is a well defined quantity which has characteristic variations vs heliographic latitude and time according to the phase of the solar sunspot cycle. We have determined the sector crossings for the whole 18 years long data base, and the location of the crossings were mapped back to the Sun using the solar wind velocity measured onboard. From the location of the sector boundaries the tilt angle of the heliospheric current sheet was estimated through the whole mission. Two shorter time intervals were analyzed in detail and compared, when Ulysses moved poleward of the magnetic sectors in 1993 and 2005, corresponding to the declining phases of cycles 22 and 23, respectively. The Ulysses observations were compared with the source surface potential field models, obtained from ground based photospheric magnetic field measurements by the Wilcox Solar Observatory. Systematic deviations have been found, which were interpreted by super radial expansion of the solar wind above coronal holes.

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