ULYSSES at 50 deg south: Constant immersion in the high-speed solar wind

Details ULYSSES at 50 deg south: Constant immersion in the high-speed solar wind ULYSSES at 50 deg south: Constant immersion in the high-speed solar wind

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1105p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 12, p. 1105-1108

Physics

79

Coronal Holes, High Speed, Solar Magnetic Field, Solar Wind, Solar Wind Velocity, Wind Variations, Magnetic Measurement, Magnetometers, Mass Spectrometers, Plasma Density, Solar Probes, Solar Rotation, Spaceborne Experiments, Ulysses Mission

Scientific paper

We present speed observations from the Ulysses solar wind plasma experiment through 50 deg south latitude. The pronounced speed modulation arising from solar rotation and the tilt of the heliomagnetic current sheet has nearly disappeared. Ulysses is now observing wind speeds in the 700 to 800 km/s range, with a magnetic polarity indicating an origin in the large south polar coronal hole. The strong compressions, rarefractions, and shock waves previously seen have weakened or disappeared. Occasional coronal mass ejections characterized by low plasma density caused by radial expansion have been observed. The coronal configuration was simple and stable in 1993, indicating that the observed solar wind changes were caused by increasing spacecraft latitude. Trends in prevailing speed with increasing latitude support previous findings. A decrease in peak speed southward of 40 deg latitude may indicate that the fastest solar wind comes from the equatorial extensions of the polar coronal holes.

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