Mathematics – Probability
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh31a1653c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH31A-1653
Mathematics
Probability
2724 Magnetopause And Boundary Layers, 7863 Turbulence (4490)
Scientific paper
The presence of a background magnetic field induces anisotropy in magnetic turbulence. This paper presents a systematic analysis of anisotropy in three different regions of the heliosphere, namely in the solar wind, and in the Earth's foreshock and magnetosheath behind a quasi parallel bow shock. A strong anisotropy is found in all cases, with very interesting cross-scale effects at the ion cyclotron frequency. In particular: i) the eigenvalues of the variance matrix have a strong intermittent behaviour, with very high localized fluctuations at small scales. As a consequence the Probability Distribution Functions are almost Gaussians at large scales and become power laws at small scales; ii) the minimum variance direction is almost parallel to the large scale magnetic field at large scales, while it become perpendicular at small scales. Differences among the three regions are discussed.
André Martial
Bruno Roberto
Carbone Vincenzo
Perri Simona
Sorriso-Valvo Luca
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