Würzburg 2018 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 8: Poster Session

EP 8.10: Poster

Mittwoch, 21. März 2018, 17:00–18:30, BSZ - Pabel HS

Reproducibility of a given anisotropic power spectrum using single- and multi-spacecraft analysis methods — •Marc Kreger, Supratik Banerjee, and Joachim Saur — Department of Geophysics and Meteorology, University of Cologne, Germany

The anisotropy of solar wind turbulence is often investigated in terms of the magnetic power spectra. For single spacecraft data, the power spectra is calculated using the wavelet transform technique whereas in the case of multi-spacecraft data, the power spectral indices are calculated indirectly through the scaling relations of structure functions. Our main objective is to compare those two methods using artificial/ synthetic data. The present study concentrates on the synthetic data which are generated for a given critically balanced power spectrum which contains power on MHD scales representing Alfvenic fluctuations (Goldreich & Sridhar,1995).

Here we follow the methodology of (Klein et al., 2012). For a known power law, we calculate the magnetic power spectrum. Then by taking the Fourier transform of its square-root, we generate the magnetic field data. The field components are attributed phases which are consistent with the divergence-free condition of the magnetic field and for simplicity we assume axisymmetry. In future, this data will be applied to obtain a power spectrum and its anisotropy based on the synthetic spacecraft data.