Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh42b..03g&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH42B-03
Physics
2162 Solar Cycle Variations (7536), 2164 Solar Wind Plasma, 2169 Sources Of The Solar Wind, 7511 Coronal Holes
Scientific paper
The correlation between solar wind speed and coronal freezing-in temperature is now well established (Geiss et al., 1995) and provides strong evidence that, near solar activity minimum, the fast solar wind originates within coronal holes, whereas the slow solar wind has a different source. The physical processes that may be responsible for the origin of either the fast or the slow solar wind are, however, not well understood, and there is no general agreement on the responsible mechanisms. We present here a detailed analysis of SWICS/Ulysses solar wind data covering almost an entire solar cycle which shows that the freezing-in temperature (TO) derived from measured O+6/O+7 ratios using the equilibrium model of Ko et al. (1996) is not only well correlated with solar wind speed (VSW) in general but also that a plot of (VSW)2 vs. 1/TO gives a characteristic and reproducible curve. This curve is precisely the one predicted by a simple model of Fisk and Schwadron (2001), where both the fast and slow solar wind is released from magnetic loops that are opened by reconnection with open field lines. We use these SWICS data to infer poorly known solar parameters (e.g. density at the footpoints of loops). Using the extended SWICS data set we also present the solar cycle and latitude dependence of these parameters. Geiss, J., G. Gloeckler, et al., The southern high speed stream: Results from SWICS/Ulysses, Science, 268, 1033-1036, 1995.\Ko, Y.-K., L. A. Fisk, G. Gloeckler, and J. Geiss, Limitations on suprathermal tails of electrons in the lower solar corona, Geophys. Res. Lett., 23, 2785-2788, 1996.\Fisk, L. A. and N. A. Schwadron, Eos. Trans. AGU, 82 (20), S302, 2001.
Fisk Len A.
Gloeckler George
Zurbuchen Thomas H.
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