Velocity variation in the high-latitude solar wind

Details Velocity variation in the high-latitude solar wind Velocity variation in the high-latitude solar wind

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...93n&link_type=abstract

International Solar Wind 8 Conference, p. 93

Other

Coronal Holes, Solar Activity, Solar Wind, Stellar Mass Ejection, Sun, Alpha Particles, Magnetohydrodynamic Waves, Polar Regions, Ulysses Mission

Scientific paper

The Ulysses spacecraft has been observing the properties of the high-latitude solar wind during a period of declining and minimum solar activity when the Sun displayed well-developed polar coronal holes. Poleward of approximately 40 deg, Ulysses remained continuously within the flow from the polar coronal hole. All was not quiet within that flow, however. In addition to coronal mass ejections seen at latitudes as high as 60 deg, there were mini-high velocity streams with amplitudes as large as 100 km/s and well developed compression regions on their leading edges and there were large-amplitude Alfven waves. The alpha-particles participate in the mini-stream variations, but not in the Alfven waves, which provides a method of separating the two phenomena. The duration of the mini-streams was typically a few days whereas the periods of the Alfven waves were usually less than 12 hours. Other properties of the mini-streams will be summarized.

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