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Solar Physics

, Volume 260, Issue 1, pp 43–57 | Cite as

Parameters of the Magnetic Flux inside Coronal Holes

  • Valentyna Abramenko
  • Vasyl Yurchyshyn
  • Hiroko Watanabe
Article

Abstract

The parameters of the magnetic flux distribution inside low-latitude coronal holes (CHs) were analyzed. A statistical study of 44 CHs based on Solar and Heliospheric Observatory (SOHO)/MDI full disk magnetograms and SOHO/EIT 284 Å images showed that the density of the net magnetic flux, B net, does not correlate with the associated solar wind speeds, V x . Both the area and net flux of CHs correlate with the solar wind speed and the corresponding spatial Pearson correlation coefficients are 0.75 and 0.71, respectively. A possible explanation for the low correlation between B net and V x is proposed. The observed non-correlation might be rooted in the structural complexity of the magnetic field. As a measure of the complexity of the magnetic field, the filling factor, f(r), was calculated as a function of spatial scales. In CHs, f(r) was found to be nearly constant at scales above 2 Mm, which indicates a monofractal structural organization and smooth temporal evolution. The magnitude of the filling factor is 0.04 from the Hinode SOT/SP data and 0.07 from the MDI/HR data. The Hinode data show that at scales smaller than 2 Mm, the filling factor decreases rapidly, which means a multifractal structure and highly intermittent, burst-like energy release regime. The absence of the necessary complexity in CH magnetic fields at scales above 2 Mm seems to be the most plausible reason why the net magnetic flux density does not seem to be related to the solar wind speed: the energy release dynamics, needed for solar wind acceleration, appears to occur at small scales below 1 Mm.

Keywords

Coronal holes Solar wind Sun: magnetic fields 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Valentyna Abramenko
    • 1
  • Vasyl Yurchyshyn
    • 1
  • Hiroko Watanabe
    • 2
  1. 1.Big Bear Solar ObservatoryBig Bear CityUSA
  2. 2.Kwasan and Hida ObservatoriesKyoto UniversityKyotoJapan

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