Physics
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30j..24m&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 10, pp. 24-1, CiteID 1517, DOI 10.1029/2003GL017136
Physics
52
Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Corotating Streams, Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Solar Cycle Variations (7536), Interplanetary Physics: General Or Miscellaneous
Scientific paper
Ulysses is now completing its second solar polar orbit, dropping back down in latitude as the Sun passes through its post-maximum phase of the solar cycle. A mid-sized circumpolar coronal hole that formed around solar maximum in the northern hemisphere has persisted and produced a highly inclined CIR, which was observed from ~70°N down to ~30°N. We find that the speed maxima in the high-speed streams follow the same slow drop in speed with decreasing latitude observed in the large polar coronal holes around solar minimum. These results suggest a solar wind acceleration effect that is related to heliolatitude or solar rotation. We also find that the solar wind dynamic pressure is significantly lower in the post-maximum phase of this solar cycle than during the previous one, indicating that while the heliosphere is larger than near solar minimum, it should be smaller than during or after the previous maximum.
Elliott Heather Alison
Goldstein Bruce E.
Gosling Jack T.
McComas David John
Schwadron Nathan A.
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