Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh44a..01s&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH44A-01
Physics
2134 Interplanetary Magnetic Fields, 2162 Solar Cycle Variations (7536), 7524 Magnetic Fields, 7536 Solar Activity Cycle (2162)
Scientific paper
The Ulysses result that r2 BR is independent of heliographic latitude at solar minimum and maximum implies that BR at any latitude is a measure the total open magnetic flux in the heliosphere. Simultaneous agreement between Ulysses and in-ecliptic data indicates that in-ecliptic BR is a faithful measure of open flux. In- ecliptic measurements extend over 4 sunspot cycles and reveal that open flux has varied by less than a factor of 2 or about one-tenth of the change in total photospheric flux. BR is a minimum at solar minimum and, in the past 3 cycles (20, 21 22), has returned to nearly the same value leading to speculation that it was invariant. However, recent observations by Ulysses in 2006-07 show a decrease in r2 BR from 3.6 to 2.3 nT (AU)2 that coincides with a decrease in the Sun's polar cap field. BR gradually ascends from solar minimum into the declining phase before decreasing to the following solar minimum. The increase is interrupted when the polar cap fields disappear and reverse sign. The interpretation of this variation is complicated by the simultaneous presence of several possible contributors to the open flux including Coronal Mass Ejecta.
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