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Parameters of the Magnetic Flux inside Coronal Holes

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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.

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Authors and Affiliations

  1. Big Bear Solar Observatory, Big Bear City, CA, 92314, USA

    Valentyna Abramenko & Vasyl Yurchyshyn

  2. Kwasan and Hida Observatories, Kyoto University, Kitakazan, Ohminecyou, Yamashina, Kyoto, 607-8471, Japan

    Hiroko Watanabe

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  1. Valentyna Abramenko
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  2. Vasyl Yurchyshyn
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  3. Hiroko Watanabe
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Correspondence to Valentyna Abramenko.

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Abramenko, V., Yurchyshyn, V. & Watanabe, H. Parameters of the Magnetic Flux inside Coronal Holes. Sol Phys 260, 43–57 (2009). https://doi.org/10.1007/s11207-009-9433-7

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