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    Multifractal Analysis of Heliospheric Magnetic Field Fluctuations Observed by Ulysses

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    Authors
    Wawrzaszek, A.
    Echim, M.
    Bruno, R.
    Discipline
    Physical sciences
    Subject
    interplanetary medium
    magnetic fields
    solar wind
    turbulence
    Audience
    Scientific
    Date
    2019
    Metadata
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    Description
    We present the multifractal study of the intermittency of the magnetic field turbulence in the fast and slow solar wind beyond the ecliptic plane during two solar minima (1997–1998, 2007–2008) and solar maximum (1999–2001). More precisely, we consider 126 time intervals of Ulysses magnetic field measurements, obtain the multifractal spectra, and examine the degree of multifractality as the measure of intermittency in the MHD range of scales, for a wide range of heliocentric distances and heliolatitudes. The results show a slow decrease of intermittency with the radial distance, which is more significant for the fast than for the slow solar wind. Analysis of Alfvénic and compressive fluctuations confirms the decrease of intermittency with distance and latitude. This radial dependence of multifractality/intermittency may be explained by a slower evolution of turbulence beyond the ecliptic plane and by the reduced efficiency of intermittency drivers with the distance from the Sun. Additionally, our analysis shows that the greatest differences between magnetic field components are revealed close to the Sun, where intermittency is the strongest. Moreover, we observe that the slow solar wind from the maximum of the solar cycle 23 exhibits in general, a lower level of multifractality (intermittency) than fast solar wind, which can be related to the idea of a new type of Alfvénic slow solar wind.
    Citation
    Wawrzaszek, A.; Echim, M.; Bruno, R. (2019). Multifractal Analysis of Heliospheric Magnetic Field Fluctuations Observed by Ulysses. , The Astrophysical Journal, Vol. 876, Issue 2, A153, DOI: 10.3847/1538-4357/ab1750.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/7284
    doi: http://dx.doi.org/10.3847/1538-4357/ab1750
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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