The solar cycle, solar wind and heliospheric magnetic field: Ulysses latitude scans at two solar minima

Details The solar cycle, solar wind and heliospheric magnetic field: Ulysses latitude scans at two solar minima The solar cycle, solar wind and heliospheric magnetic field: Ulysses latitude scans at two solar minima

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh24a..02m&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH24A-02

Physics

2134 Interplanetary Magnetic Fields, 2162 Solar Cycle Variations (7536), 2164 Solar Wind Plasma, 2169 Solar Wind Sources

Scientific paper

The Ulysses mission has produced corresponding sets of observations near two successive solar minima. A recent rapid scan from the solar equator to the polar caps in 2006 -07 provided solar wind and magnetic field measurements complementary to those in 1994-1995. Although the coronal wind is only 3 percent less fast, ion and electron densities decreased by 17 percent, causing solar wind dynamic pressure, pw, to be weaker by 20 percent while the open magnetic flux decreased by 36 percent. In the slow low latitude solar wind, pw has the same value and is independent of latitude along with the radial component of the magnetic pressure. The current solar cycle is also weaker including the polar magnetic field strength. These changes raise important questions that challenge our understanding of the solar -heliospheric connection. What causes related decreases in pw and the total open flux? How are they related to changes on the Sun? We will present an interpretation based on a recent model that relates these observables to the rate of emerging solar magnetic flux.

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