Abstract
The correlations between the plasma characteristics of the solar wind flow in the vicinity (± 12 hr) of stream-free sector boundaries near Earth are examined using the composite data base of interplanetary plasma for the period 1965–1980. We confirm the result of Lopez et al. (1986) of an inverse relationship of the proton temperature (T p) with the momentum flux density (NV 2) in the low speed wind at 1 AU. The coefficients of lines of best fit to the T pvs NV 2(as well as T pvs V) distribution in our sample are, however, significantly different from those of the undifferentiated sample of low speed wind considered by Lopez et al. such that T pis, in general, lower than expected. We find further that the proton number density (N) varies as the inverse cube of the flow speed (V) indicating an invariance of the kinetic energy flux density (NV 3) relative to velocity structure in the plasma flow around stream-free boundaries. These average relationships, which are unaffected by interplanetary dynamical processes, are suggested to be due to sub-sonic addition of momentum and energy to the solar wind flow from the source structures, namely coronal streamers.
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Borrini, G., Gosling, J. T., Bame, S. J., Feldman, W. C, and Wilcox, J. M.: 1981, J. Geophys. Res. 86, 4565.
Burlaga, L. F. and Ogilvie, K. W.: 1970a, Solar Phys. 15, 61.
Burlaga, L. F. and Ogilvie, K. W.: 1970b, Astrophys. J. 159, 659.
Burlaga, L. F. and Ogilvie, K. W.: 1973, J. Geophys. Res. 78, 2028.
Feldman, W. C., Asbridge, J. R., Bame, S. J. and Gosling, J. T.: 1977, in O. R. White (ed.), The Solar Output and Its Variation, Colorado Associated University Press, Boulder, Colorado, p. 351.
Feldman, W. C., Asbridge, J. R., Bame, S. J., Fenimore, E. E., and Gosling, J. T.: 1981, J. Geophys. Res. 86, 5408.
Fry, C. D. and Akasofu, S. I.: 1985, Planetary Space Sci. 33, 925.
Hundhausen, A. J., Bame, S. J., Asbridge, J. R., and Sydoriak, S. J.: 1970, J. Geophys. Res. 75, 4643.
King, J. H.: 1977, Interplanetary Medium Data Book and Appendix, NSSDC/WDC-A, R & S 77–04 (a), GSFC, Greenbelt, MD, U.S.A.
King, J. H.: 1979, Interplanetary Medium Data Book Supplement 1, 1975–1978, NSSDC/WDC-A, R & S 79–08, GSFC, Greenbelt, MD, U.S.A.
King, J. H.: 1986, Interplanetary Medium Data Book Supplement 3, 1977–1985, NSSDC/WDC-A, R & S 86–04 (a), GSFC, Greenbelt, MD, U.S.A.
Klein, L. W. and Burlaga, L. F.: 1982, J. Geophys. Res. 87, 613.
Leer, E. and Holzer, T. E.: 1980, J. Geophys. Res. 85, 4681.
Leer, E., Holzer, T. E., and Tor Fla: 1982, Space Sci. Rev. 33, 161.
Lopez, R. E. and Freeman, J. W.: 1986, J. Geophys. Res. 91, 1701.
Lopez, R. E., Freeman, J. W., and Roelof, E. C.: 1986, Geophys. Res. Letters 13, 640.
Marsch, E. and Richter, A. K.: 1984, J. Geophys. Res. 89, 6599.
Mullan, D. J.: 1983, Astrophys. J. 272, 325.
Neugebauer, M. and Snyder, C. W.: 1966, J. Geophys. Res. 71, 4469.
Pizzo, V., Gosling, J. T., Hundhausen, A. J., and Bame, S. J.: 1973, J. Geophys. Res. 78, 6569.
Schwenn, R.: 1983, in M. N. Neugebauer (ed.), Solar Wind Five, NASA Conference Publ. 2280, p. 489.
Steinitz, R.: 1983, Solar Phys. 83, 379.
Steinitz, R. and Eyni, M.: 1980, Astrophys. J. 241, 417.
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Sastri, J.H. Solar wind flow associated with stream-free sector boundaries at 1 AU. Sol Phys 111, 429–437 (1987). https://doi.org/10.1007/BF00148530
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DOI: https://doi.org/10.1007/BF00148530