Abstract
The synoptic map of the solar wind speed (SWS) estimated by the computer-assisted tomography (CAT) method with interplanetary scintillation observations is constructed for the 1909 Carrington rotation. A similar synoptic map of expansion rate (RBR) of the coronal magnetic field calculated by the so-called 'potential model' with the photospheric magnetic field is also constructed under the radial field assumption (RF model). These maps consist of 64 800 (180×360) data points of equal area. We examine for the first time relations between the SWS estimated by the CAT technique and the RBR calculated by the RF model. A highly significant correlation is found between the SWS and the RBR. A simple correlation coefficient is about −0.72; that is, high-velocity winds emanate from photospheric areas corresponding to a low expansion rate of the coronal magnetic field, and low-velocity winds emanate from photospheric areas of high expansion rate. This result suggests that there is some acceleration mechanism relating to the coronal field expansion.
Similar content being viewed by others
References
Altschuler, M. D. and Newkirk, G., Jr.: 1969, Solar Phys. 9, 131.
Altschuler, M. D., Levine, R. H., Stix, M., and Harvey, J. W.: 1977, Solar Phys. 51, 345.
Asai, K., Kojima, M., Tokumaru, M., Yokobe, A., Jackson, B. V., and Manoharan, P. K.: 1998, J. Geophys. Res. 103, 1991.
Hakamada, K.: 1995, Solar Phys. 159, 89.
Hakamada, K.: 1998, Solar Phys. 181, 73.
Hakamada, K. and Kojima, M.: 1994, Solar Phys. 153, 419.
Hakamada, K., Kojima, M., Kakinuma, T.: 1991, J. Geophys. Res. 96, 5397.
Hewish, A., Scott, P. F., and Wills, D.: 1964, Nature 203, 1214.
Hoeksema, J. T. and Scherrer, P. H.: 1986, 'The Solar Magnetic Field-1976 through 1985, World Data Cent. A for Sol.-Terr. Phys.', Rep. UAG-94, NOAA, Boulder.
Jackson, B. V., Hick, P. L., Kojima, M., and Yokobe, A.: 1998, J. Geophys. Res. 103, 12049.
Kojima, M. and Kakinuma, T.: 1990, Space Sci. Rev. 53, 173.
Kojima, M., Tokumaru, M., Watanabe, H., Yokobe, A., Asai, K., Jackson, B. V., and Hick, P. L.: 1998, J. Geophys. Res. 103, 1981.
Levine, R. H.: 1978, J. Geophys. Res. 83, 4193.
Levine, R. H., Altschuler, M. D., and Harvey, J. W.: 1977, J. Geophys. Res. 82, 1061.
Riesebieter, W. and Neubauer, F. M.: 1979, Solar Phys. 63, 127.
Schatten, K. H., Wilcox, J. M., and Ness, N. F.: 1969, Solar Phys. 9, 442.
Wang, Y.-M. and Sheeley, N. R., Jr.: 1990, Astrophys. J. 355, 726.
Wang, Y.-M. and Sheeley, N. R., Jr.: 1992, Astrophys. J. 392, 310.
Wang, Y.-M. and Sheeley, N. R., Jr., Phillips, J. L., and Goldstein, B. E.: 1997, Astrophys. J. 448, L51.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Hakamada, K., Kojima, M. Solar Wind Speed and Expansion Rate of the Coronal Magnetic Field during Carrington Rotation 1909. Solar Physics 187, 115–122 (1999). https://doi.org/10.1023/A:1005183914772
Issue Date:
DOI: https://doi.org/10.1023/A:1005183914772