Abstract
Solar wind isotropic proton temperatures as measured out to 12.2 AU heliocentric distance by the Ames plasma analyzer aboard Pioneer-10 are presented as consecutive averages over three Carrington solar rotations and discussed. The weighted least-squares fit of average temperature to heliocentric radial distance, R, yields the power law R -0.52. These average proton temperatures are not correlated as well with Pioneer-10's heliocentric radial distance (-0.85) as are the corresponding average Zürich sunspot numbers R z (-0.95). Consequently, it is difficult to isolate the spatial gradient in the Pioneer-10 solar wind proton temperatures using that data alone.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Asbridge, J. R., Bame, S. J., and Feldman, W. C.: 1974, Solar Phys. 37, 451.
Bame, S. J., Asbridge, J. R., Feldman, W. C., and Gosling, J. T.: 1977, J. Geophys. Res. 82, 1487.
Barnes, A.: 1974, Adv. Electr. Electron Phys. 36, 1.
Bevington, P. R.: 1969, Data Reduction and Error Analysis for the Physical Sciences, McGraw-Hill Book Co., New York.
Collard, H. R. and Wolfe, J. H.: 1974, in C. T. Russell (ed.), Solar Wind Three, Institute of Geophysics and Planetary Physics, UCLA, Los Angeles, Calif., U.S.A.
Croxton, F. E.: 1959, Elementary Statistics, Dover Pubs., Inc., New York.
Eyni, M. and Steinitz, R.: 1978, J. Geophys. Res. 83, 215.
Feldman, W. C., Asbridge, J. R., Bame, S. J., and Montgomery, M. D.: 1974, Rev. Geophys. Space Phys. 12, 715.
Feldman, W. C., Abraham-Shrauner, B., Asbridge, J. R., and Bame, S. J.: 1976, in D. J. Williams (ed.), Physics of Solar Planetary Environments, Am. Geophys. Union, Wash., D.C., U.S.A.
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 Assoc. Univ. Press, Boulder, Colo., U.S.A.
Feldman, W. C., Asbridge, J. R., Bame, S. J., and Gosling, J. T.: 1978, J. Geophys. Res. 83, 2177.
Goldstein, B. E. and Jokipii, J. R.: 1977, J. Geophys. Res. 82, 1095.
Hald, A.: 1952, Statistical Theory with Engineering Applications, Wiley, New York.
Hall, C. F.: 1974, Science 183, 301.
Holzer, T. E.: 1977, Rev. Geophys. Space Phys. 15, 467.
Holzer, T. E. and Leer, E.: 1973, Astrophys. Space Sci. 24, 335.
Intriligator, D. S.: 1977, in M. A. Shea, D. F. Smart, and S. T. Wu (eds.), Study of Travelling Interplanetary Phenomena/1977, D. Reidel Publ. Co., Dordrecht, Holland.
McKibbin, D. D., Wolfe, J. H., Collard, H. R., Savage, H. F., and Molari, R.: 1977, Space Sci. Instr. 3, 219.
Smith, E. J. and Wolfe, J. H.: 1976, Geophys. Res. Lett. 3, 137.
Smith, E. J. and Wolfe, J. H.: 1977, in M. A. Shea, D. F. Smart, and S. T. Wu (eds.), Study of Travelling Interplanetary Phenomena/1977, D. Reidel Publ. Co., Dordrecht, Holland.
Thomas, G. E.: 1978, Ann. Rev. Earth Planetary Sci. 6, 173.
Weller, C. S. and Meier, R. R.: 1974, Astrophys. J. 193, 471.
Wolfe, J. H.: 1976, in E. A. Steinhoff (ed.), The Eagle Has Returned, Vol. 43, Science and Technology Series, Suppl. Adv. Astron. Sci., Am. Astronaut. Soc.-Univelt, Inc., San Diego, Calif., U.S.A.
Wolfe, J. H., Mihalov, J. D., Collard, H. R., McKibbin, D. D., Frank, L. A., and Intriligator, D. S.: 1974, J. Geophys. Res. 79, 3489.
Wolfe, J. H. and Mihalov, J. D.: 1977, EOS 58, 1225.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Mihalov, J.D., Wolfe, J.H. Pioneer-10 observation of the solar wind proton temperature heliocentric gradient. Sol Phys 60, 399–406 (1978). https://doi.org/10.1007/BF00156539
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00156539