Y.-M. Wang and N. R. Sheeley, Jr. 2006 ApJ 653 708 doi:10.1086/508929
Y.-M. Wang1 and N. R. Sheeley, Jr.1
Show affiliationsThe Ulysses spacecraft is now well into its third polar orbit around the Sun. Using stackplot displays, we summarize the wind speeds and interplanetary sector polarities recorded by Ulysses since its launch in 1990 and relate the observed patterns to the global evolution of open magnetic regions (coronal holes) over the solar cycle. We verify that the wind speeds are inversely correlated with the rate of flux-tube divergence in the corona, as derived from a current-free extrapolation of the measured photospheric field. We identify the source of each of the long-lived, high-speed streams encountered by Ulysses and discuss their formation, evolution, and rotational properties.
interplanetary medium; solar wind; Sun: corona; Sun: magnetic fields
Issue 1 (2006 December 10)
Received 2006 June 19, accepted for publication 2006 September 1
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