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McComas et al. 2003
McComas, D.J., Elliott, H.A., Schwadron, N.A., Gosling, J.T., Skoug, R.M. and Goldstein, B.E. (2003). The three-dimensional solar wind around solar maximum. Geophysical Research Letters 30: doi: 10.1029/2003GL017136. issn: 0094-8276.

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.

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Abstract

Keywords
Interplanetary Physics, Solar wind plasma, Interplanetary Physics, Corotating streams, Interplanetary Physics, Interplanetary shocks, Interplanetary Physics, Solar cycle variations, Interplanetary Physics, General or miscellaneous
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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