Abstract
We outline a theory for the origin and acceleration of the fast solar wind as a consequence of network microflares releasing a spectrum of high frequency Alfvén waves which heat (by cyclotron absorption) the corona close to the Sun. The significant features of our model of the fast wind are that the acceleration is rapid with the sonic point at around two solar radii, the proton temperatures are high (~ 5 million degrees) and the minor ions are correspondingly hotter, roughly in proportion to their mass. Moreover we argue that since the energy flux needed to power the quiet corona in closed field regions is about the same as that needed to drive the fast solar wind, and also because at deeper levels (< 2 × 105 K) there is no great difference in the properties of supergranules and network in closed and open field regions, the heating process (i.e., dissipation of high frequency waves) must be the same in both cases.
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References
Axford, W. I.: 1980, Very hot plasmas in the solar system, in Highlights of Astronomy,ed. P. A. Wayman, 5, pp. 351–359.
Axford, W. I., and McKenzie, J. F.: 1992, The origin of high speed solar wind streams, in Solar Wind Seven, eds. E. Marsch and R. Schwenn (Oxford: Pergamon Press), pp. 1–5.
Axford, W. I., and McKenzie, J. F.: 1997, The solar wind, in Cosmic Winds and the Heliosphere,eds. J. R. Jokipii, C. P. Sonett, and M. S. Giampapa (Tucson: University of Arizona Press), pp. 31–36.
Banaszkiewicz, M., Axford, W. I., and McKenzie, J. F.: 1998, An analytic solar magnetic field model, Astron. Astrophys., 337, 940–944.
Belcher, J. W.: 1971, Alfv´enic wave pressure in the solar wind, Astrophys. J., 168, 509–524.
Borrini, G., Gosling, J. T., Bame, S. J., Feldman, W. C., and Wilcox, J. M.: 1981, Solar wind helium and hydrogen structures near the heliospheric current sheet: A signal of coronal streamers at 1 AU, J. Geophys. Res., 86, 4565–4573.
Czechowski, A., Ratkiewicz, R., McKenzie, J. F., and Axford, W. I.: 1998, Heating and acceleration of minor ions in the solar wind, Astron. Astrophys., 335, 303–308.
Dowdy, J. F., Jr., Rabin, D., and Moore, R. L.: 1986, On the magnetic structure of the quiet transition region, Solar Phys., 105, 35–45.
Fisher, R., and Guhathakurta, M.: 1995, Physical properties of polar coronal rays and holes as observed with the Spartan 201–01 coronagraph, Astrophys. J., 447, L139- L142.
Gabriel, A. H.: 1976a, A magnetic model of the solar transition region, Phil. Trans. Roy. Soc., A281, 339–352.
Gabriel, A. H.: 1976b, Structure of the quiet chromosphere and corona, in The Energy Balance and Hydrodynamics of the Solar Chromosphere and Corona,ed. R. Bonnet and P. Delache (Clermont-Ferrand: G. de Bussal), pp. 375–418.
Geiss, J., Gloeckler, G., von Steiger, R., Balsiger, H., Fisk, L. A., Galvin, A. B., Ipavich, F. M., Livi, S., McKenzie, J. F., Ogilvie, K.W., and Wilken, B.: 1995, The southern high-speed stream: Results from the SWICS instrument on Ulysses, Science, 268, 1033–1036.
Giordano, S., Antonucci, E., and Dodero, M. A.: 1998, Velocity of the fast solar wind in coronal holes, Adv. Space Res.,submitted.
Gold, T.: 1964, Magnetic energy shedding in the solar atmosphere, in Proc. AAS-NASA Symp. on The Physics of Solar Flares,pp. 389–395.
Guhathakurta, M.: 1999, these proceedings.
Hartle, R. E., and Sturrock, P. A.: 1968, Two-fluid model of the solar wind, Astrophys. J., 151, 1155–1170.
Holzer, T. E., and Axford, W. I.: 1970, The theory of stellar winds and related flows, Ann. Rev. Astron. Astrophys., 8, 31–60.
Hudson, H. S.: 1991, Solar flares, microflares, nanoflares, and coronal heating, Solar Phys., 133, 357–369.
Isenberg, P. A., and Hollweg, J. V.: 1983, On the preferential acceleration and heating of solar wind heavy ions, J. Geophys. Res., 88, 3923–3935.
Kopp, R. A., and Holzer, T. E.: 1976, Dynamics of coronal hole regions, 1, Steady polytropic flow with multiple critical points, Sol. Phys., 49, 43.
Krucker, S., and Benz, A. O.: 1998, Energy distribution of heating processes in the quiet solar corona, Astrophys. J., 501, L213–L216.
Leer, E., Holzer, T. E., and Flå , T.: 1982, Acceleration of the solar wind, Space Sci. Rev., 33, 161–200.
Li, X., Esser, R., Habbal, S. R., and Hu, Y.-Q.: 1997, Influence of heavy ions on the high-speed solar wind, J. Geophys. Res., 102, 17,419–17,432.
Marsch, E., and Tu, C.-Y.: 1997, Solar wind and chromospheric network, Solar Phys., 176, 87–106.
McKenzie, J. F., Axford, W. I., and Banaszkiewicz, M.: 1997, The fast solar wind, Geophys. Res. Lett., 24, 2877–2880.
McKenzie, J. F., Banaszkiewicz, M., and Axford, W. I.: 1995, Acceleration of the high speed solar wind, Astron. Astrophys., 303, L45–L48.
McKenzie, J. F., Sukhorukova, G. V., and Axford, W. I.: 1998a, The source region of the fast solar wind, Astron. Astrophys., 330, 1145–1148.
McKenzie, J. F., Sukhorukova, G. V., and Axford, W. I.: 1998b, Structure of a photoionization layer in the solar chromosphere, Astron. Astrophys., 332, 367–373.
Parker, E. N.: 1958, Dynamics of the interplanetary gas and magnetic fields, Astrophys. J., 128, 664–676.
Parker, E. N.: 1988, Nanoflares and the solar wind X-ray corona, Astrophys. J., 330, 474–479.
Rosner, R., Tucker,W.H., and Vaiana, G. S.: 1978, Dynamics of the quiescent solar corona, Astrophys. J., 220, 643–665.
Schmidt, W. K. H., Rosenbauer, H., Shelley, E. G., and Geiss, J.: 1980, On temperature and speed of He2+ and O6+ ions in the solar wind, Geophys. Res. Lett., 7, 697–700.
Smith, E. J., et al.:1997, Radial and azimuthal components of the heliospheric magnetic field:Ulysses observations, Adv. Space Res., 20, 47–53.
Tu, C.-Y.: 1987, A solar wind model with the power spectrum of Alfv´enic fluctuations, Solar Phys., 109, 149–186.
Weber, E. J.: 1973, Multi-ion plasma in astrophysics, Astrophys. Space Sci., 20, 391–465.
Williams, L. L.: 1995, Heat flux and viscosity of protons in the collisionless solar wind, Astrophys. J., 453, 953–958.
Yeh, T.: 1970, A three-fluid model of solar winds, Planet. Space Sci., 18, 199–215.
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Axford, W.I., McKenzie, J.F., Sukhorukova, G.V. et al. Acceleration of the High Speed Solar Wind in Coronal Holes. Space Science Reviews 87, 25–41 (1999). https://doi.org/10.1023/A:1005197529250
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DOI: https://doi.org/10.1023/A:1005197529250