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A search for solar wind velocity changes between 0.7 and 1 AU

Intriligator, D. S. and Neugebauer, M. (1975) A search for solar wind velocity changes between 0.7 and 1 AU. Journal of Geophysical Research, 80 (10). pp. 1332-1334. ISSN 0148-0227.

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Simultaneous observations of the solar wind velocity as measured at the Pioneer 9 and Ogo 5 spacecraft during five solar rotations in 1968 and 1969 are presented. During this time, Pioneer 9 was traveling in toward the sun to approximately 0.7 AU while the earth orbiter Ogo 5 was spending long periods in the interplanetary medium. A comparison of the 3-hour averages of solar wind velocity obtained at both spacecraft indicates that the same basic solar wind velocity structure was seen at both spacecraft. There was no statistically significant dependence of average velocity on radial distance from the sun. The amplitude of variations about the average velocity apparently decreased with increasing distance from the sun; some but probably not all of this decreased variation is consistent with the exchange of momentum between high-velocity and low-velocity streams. The correlation coefficient of pairs of velocity averages computed from a corotation model decreases with increasing distance between the two spacecraft.

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Additional Information:© 1975 American Geophysical Union. Received February 13, 1973; accepted December 3, 1974. This work was sponsored by NASA grant NGR 05-002-165, NGR 05-002-59, NGR 05-018-181, contract NAS-7-100, and by grant PF-021 President's Fund Caltech. The Editor thanks A. Egidi and J. T. Gosling for their assistance in evaluating this report.
Funding AgencyGrant Number
NASANGR 05-002-165
NASANGR 05-002-59
NASANGR 05-018-181
Caltech President's FundPF-021
Issue or Number:10
Record Number:CaltechAUTHORS:20170405-143813886
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Official Citation:Intriligator, D. S., and M. Neugebauer (1975), A search for solar wind velocity changes between 0.7 and 1 AU, J. Geophys. Res., 80(10), 1332–1334, doi:10.1029/JA080i010p01332
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75743
Deposited By: Tony Diaz
Deposited On:05 Apr 2017 21:46
Last Modified:03 Oct 2019 16:53

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