Multifractal structure of turbulence in the magnetospheric cusp
Magnetospheric cusps are regions which are characterized by highly turbulent plasma. We have used Polar magnetic field data to study the structure of turbulence in the cusp region. The wavelet transform modulus maxima method (WTMM) has been applied to estimate the scaling exponent of the partiti...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2004-07-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/22/2431/2004/angeo-22-2431-2004.pdf |
| Summary: | Magnetospheric cusps are regions which are characterized by highly
turbulent plasma. We have used Polar magnetic field data to study the
structure of turbulence in the cusp region. The wavelet transform modulus
maxima method (WTMM) has been applied to estimate the scaling exponent of
the partition function and singularity spectra. Their features are similar
to those found in the nonlinear multifractal systems. We have found that the
scaling exponent does not allow one to conclude which intermittency model fits
the experiment better. However, the singularity spectra reveal that
different models can be ascribed to turbulence observed under various IMF
conditions. For northward IMF conditions the turbulence is consistent with
the multifractal <i>p</i>-model of fully developed fluid turbulence. For southward
IMF experimental data agree with the model of non-fully developed
Kolmogorov-like fluid turbulence. |
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| ISSN: | 0992-7689 1432-0576 |