Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh33b..02h&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH33B-02
Physics
7863 Turbulence (4490)
Scientific paper
We present a new, wavelet-based analysis of solar wind magnetic field data which makes it possible to determine the wavevector anisotropy of the fluctuations with respect to the local mean field direction. We demonstrate, consistent with published work, that the fluctuations within the inertial range are dominated by power in wavevectors at large angles to the field (so-called "2D"). In an important new result, we also show how the spectral index, γ, varies with the angle between the radial (measurement) and mean field directions. At most angles γ ≍ 5/3 , however this smoothly transitions to 2 for small angles, i.e., those associated with fluctuations with wavevectors nearly parallel to the field ("slab"). We also demonstrate significant deviations from a simple slab and 2D model, perhaps due to power at intermediate angles or finite wave propagation speeds. Finally, we discuss the anisotropy of the field magnitude spectrum, a proxy for density variations, and how this relates to the anisotropy in the field components.
Forman Miriam
Horbury Timothy
Oughton Sean
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