Abstract
We present a detailed analysis of the Pioneer 9 VLF electric field observations for 20 selected storm periods covering a heliocentric range extending from 0.754 AU to 0.99 AU. Although data from only two low frequency channels are available, the results of the present study tend to confirm the preliminary speculation by Scarf and Siscoe (1971) that the turbulentE-field spectrum in the disturbed solar wind has a significant radial gradient.
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Scarf, F.L., Green, I.M. & Burgess, J.S. The Pioneer 9 electric field experiment. Astrophys Space Sci 20, 499–507 (1973). https://doi.org/10.1007/BF00642219
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DOI: https://doi.org/10.1007/BF00642219