Multi-spacecraft measurement of anisotropic power levels and scaling in solar wind turbulence
Measurements by the four Cluster spacecraft in the solar wind are used to determine quantitatively the field-aligned anisotropy of magnetohydrodynamic inertial range turbulence power levels and spectral indexes. We find, using time-lagged second order structure functions, that the spectral index...
Main Authors: | , |
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Format: | Article |
Language: | English |
Published: |
Copernicus Publications
2009-08-01
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Series: | Annales Geophysicae |
Online Access: | https://www.ann-geophys.net/27/3019/2009/angeo-27-3019-2009.pdf |
Summary: | Measurements by the four Cluster spacecraft in the solar wind are used to
determine quantitatively the field-aligned anisotropy of magnetohydrodynamic
inertial range turbulence power levels and spectral indexes. We find, using
time-lagged second order structure functions, that the spectral index is near
2 around the field-parallel direction, which is consistent with a "critical
balance" turbulent cascade. Solar wind fluctuations are found to be
anisotropic with power mainly in wavevectors perpendicular to the mean field,
where the spectral index is around 5/3. |
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ISSN: | 0992-7689 1432-0576 |