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Solar wind structure at large heliocentric distances: An interpretation of Pioneer 10 observations

1976; American Geophysical Union; Volume: 81; Issue: 7 Linguagem: Inglês

10.1029/ja081i007p01436

2156-2202

A. J. Hundhausen, J. T. Gosling,

Astro and Planetary Science

Journal of Geophysical Research (1896-1977)Volume 81, Issue 7 p. 1436-1440 Particles and Fields—Interplanetary Space Solar wind structure at large heliocentric distances: An interpretation of Pioneer 10 observations A. J. Hundhausen, A. J. HundhausenSearch for more papers by this authorJ. T. Gosling, J. T. GoslingSearch for more papers by this author A. J. Hundhausen, A. J. HundhausenSearch for more papers by this authorJ. T. Gosling, J. T. GoslingSearch for more papers by this author First published: 1 March 1976 https://doi.org/10.1029/JA081i007p01436Citations: 151AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Examination of hourly values of the solar wind speed observed by the Pioneer 10 spacecraft beyond a heliocentric distance of 4 AU reveals (1) a prevalent 'sawtoothlike' speed-time profile, most speed fluctuations displaying a rapid rise and a much slower decline, and (2) the nearly universal appearance of abrupt (on the 1-hour time resolution of these data) changes in the speed on the rising portions of the speed fluctuations. These previously unreported characteristics, as well as the rate of decay of stream amplitudes derived earlier by Collard and Wolfe, are in general agreement with the predictions of stream propagation models that neglect any conversion of kinetic energy to thermal energy outside of shock fronts. Thus the Pioneer 10 observations give the first confirmation of the general concept of solar wind stream evolution employed in these models, i.e., that solar wind speed inhomogeneities appear to steepen to form shock waves and that the 'wave amplitudes' decay slowly as the shock waves propagate outward from the sun. References Burlaga, L. F., Interplanetary streams and their interaction with the earth, Space Sci. Rev., 17, 327, 1975. Burlaga, L. F., K. W. Ogilvie, Solar wind temperature and speed, J. Geophys. Res., 78, 2028, 1973. Burlaga, L. F., K. W. Ogilvie, D. H. Fairfield, M. D. Montgomery, S. J. Bame, Energy transfer at colliding streams in the solar wind, Astrophys. J., 164, 137, 1971. Chao, J. K., Steepening of nonlinear waves in the solar wind, J. Geophys. Res., 78, 5411, 1973. Collard, H. R., J. H. Wolfe, Radial gradient of solar wind velocity from 1 to 5 AU, Solar Wind Three C. T. Russell, 281, Institute of Geophysics and Planetary Physics, University of California, Los Angeles, 1974. Gosling, J. T., Large-scale inhomogeneities in the solar wind of solar origin, Rev. Geophys. Space Phys., 13, 1053, 1975. Gosling, J. T., A. J. Hundhausen, V. Pizzo, J. R. Asbridge, Compressions and rarefactions in the solar wind: Vela 3, J. Geophys. Res., 77, 5442, 1972. Hundhausen, A. J., Coronal Expansion and Solar Wind, Springer, New York, 1972. Hundhausen, A. J., Nonlinear model of high-speed solar wind streams, J. Geophys. Res., 78, 1528, 1973a. Hundhausen, A. J., Evolution of large-scale solar wind structures beyond 1 AU, J. Geophys. Res., 78, 2035, 1973b. Intriligator, D. S., M. Neugebauer, A search for solar wind velocity changes between 0.7 and 1 AU, J. Geophys. Res., 80, 1332, 1975. Jokipii, J. R., L. Davis Jr., Long-wavelength turbulence and the heating of the solar wind, Astrophys. J., 156, 1101, 1969. Mihalov, J. D., D. S. Colburn, H. R. Collard, B. F. Smith, C. P. Sonett, J. H. Wolfe, Pioneer solar plasma and magnetic field measurements in interplanetary space during August 2-17, 1972, Correlated Interplanetary and Magnetospheric Observations D. E. Page, 545, D. Reidel, Dordrecht, Netherlands, 1974. Montgomery, M. D., The solar wind in the outer solar system, Space Sci. Rev., 14, 559, 1973. Pizzo, V., J. T. Gosling, A. J. Hundhausen, S. J. Bame, Large-scale dynamical effects upon the solar wind flow parameters, J. Geophys. Res., 78, 6469, 1973. Smith, E. J., J. H. Wolfe, Response of the distant solar wind to solar activity: Pioneers 10 and 11, Program/Abstract, COSPAR, Eighteenth Plenary Meeting, 174, Bulg. Acad. of Sci. Press, Varna, 1975. Wolfe, J. H., H. R. Collard, J. D. Mihalov, D. S. Intriligator, Preliminary Pioneer 10 encounter results from the Ames Research Center plasma analyzer experiment, Science, 183, 303, 1974. Citing Literature Volume81, Issue7Space Physics1 March 1976Pages 1436-1440 ReferencesRelatedInformation