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Are critical points important in the Solar Probe Mission? This is a briefdiscussion of the nature of critical points in solar wind models, what thismeans physically in the 'real' solar wind, and what can be expected along anominal Solar Probe Orbit. The conclusion is that the regions where the windbecomes transonic and trans-Alfvenic, which may be irregular and varying, mayreveal interesting physics, but the mathematically defined critical pointsthemselves are of less importance.

Sonic and Alfvenic Critical Point and the Solar Probe Mission: presentation to the Solar Probe Science and Technology Definition Team