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We have the Advanced Composition Exporer (ACE), which orbits in the L1 libration point as a source for solar wind velocity and density (particles/cm^3) data. Typically, at a velocity in the range of 400 km/s, it takes about 4 days for solar wind changes to reach ACE. Measured solar wind velocities and densities tend to change from moment to moment. Official sunspot counts are obtained from Earth-based telescopes and change much more slowly.

From casual observation, there appears to be a positive correlation between solar wind velocity and density with sunspot count. Can anyone please gve me a reference that addresses this topic?

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Have a look at leif.org/research/AGU%20Spring%202008%20SH44A-02.pdf and other talks/papers in Leif's page. –  anna v Feb 17 '12 at 5:09
    
Thank you Mark & Anna for the references. Leif does indeed have a number of solar articles that are quite enlightening. –  Michael Luciuk Feb 17 '12 at 18:16
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