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Croft 1979
Croft, T.A. (1979). A graphical summary of solar wind electron content observations by Pioneer 6, 8, and 9. Journal of Geophysical Research 84: doi: 10.1029/JA084iA02p00439. issn: 0148-0227.

Between 1965 and 1972, solar wind density measurements were obtained by Mariner 5 and Pioneer 6, 7, 8, and 9 using a radio science method called the 'dual-frequency experiment.' The measurements and data processing are now terminated. We present here a graphical summary of the best of the resulting data, showing the average electron number density of the solar wind across radio paths that vary in length up to 1.8 AU and that lie broadside to the flow direction. These graphs summarize 3.4 years of observations with a time resolution of 1 hour; the measurements provided 1-min resolution and spanned 7 years. Because the orientation and length of the paths change continually and have a major influence on the interpretation of these data, we provide a spacecraft trajectory chart and a plot of the corotation interval.

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Journal
Journal of Geophysical Research
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American Geophysical Union
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