Ulysses Transition into the Newly Formed Southern Fast Stream Observed with Ulysses- SWICS

Details Ulysses Transition into the Newly Formed Southern Fast Stream Observed with Ulysses- SWICS Ulysses Transition into the Newly Formed Southern Fast Stream Observed with Ulysses- SWICS

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh52a..07v&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH52A-07

Physics

2101 Coronal Mass Ejections (7513), 2102 Corotating Streams, 2162 Solar Cycle Variations (7536), 2164 Solar Wind Plasma, 7511 Coronal Holes

Scientific paper

The Ulysses spacecraft currently performs the third revolution on its unique, high-inclination orbit around the Sun. Like on the first orbit the current observations are taken during the declining to minimum phase of the solar activity cycle, albeit with inverted magnetic polarity. However, our observations show rather significant and surprising differences between the configurations of the Heliosphere during the first and the third orbits of Ulysses. In 1992-93 the transition from the slow, variable solar wind into the high-speed stream from the southern polar coronal hole was marked by a regular oscillation from slow to fast solar wind and back once every solar rotation for more than a year, indicating a relatively flat but tilted heliospheric current sheet. The current transition has been much less regular, with slow and variable solar wind pertaining to higher latitudes than back then. The transition proper was much quicker, with duration of only 2-3 solar rotations. Since early 2006 Ulysses is now immersed in the polar fast stream, but this looks also somewhat different than the previous one as it shows some variability and may even contain coronal mass ejections with a composition signature, something that was never observed during more than 2.5 years of polar stream observations in the previous cycle.

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