What Determines the Solar Wind Speed ?

Details What Determines the Solar Wind Speed ? What Determines the Solar Wind Speed ?

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh24a..04s&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SH24A-04

Physics

2149 Mhd Waves And Turbulence, 2169 Sources Of The Solar Wind, 3210 Modeling, 7511 Coronal Holes, 7827 Kinetic And Mhd Theory

Scientific paper

Recent observations by Interplanetary Scintillation measurements by Nagoya-STEL group (Hirano et al.2003; Kojima et al.2004) show that solar wind speed is well-correlated with B/f, where B is radial magnetic field strength at the solar surface and f is a super-radial expansion factor of open flux tubes. We show that this correlation is nicely explained by dissipation of Alfven waves no matter what types of the wave dissipation processes operate. B determines the input energy flux of Alfven waves and f controls adiabatic loss of the wave energy, so that B/f is an important control parameter which determines the solar wind speed. (reference ) [1] Hirano, M., Kojima, M., Tokumaru, M., Fujiki, K., Ohmi, T., Yamashita, M, Hakamada, K., and Hayashi, K. 2003,, Eos Trans. AGU, 84(46), Fall Meet. Suppl., Abstract SH21B-0164 [2] Kojima, M., K. Fujiki, M. Hirano, M. Tokumaru, T. Ohmi, and K. Hakamada, 2004, "The Sun and the heliosphere as an Integrated System", Giannina Poletto and Steven T. Suess, Eds. Kluwer Academic Publishers, in press

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