Spectral anisotropy of solar wind turbulence in the inertial range and dissipation range

Journal Article · Thu Mar 25 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3395817· OSTI ID:21371705

Podesta, J J ^[1]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico, 87544 (United States)

Wavelet analysis is a tool that can simultaneously analyze spacecraft data in both time and frequency. This enables the magnetic energy spectrum (trace spectrum) to be measured for different angles between the local mean magnetic field B{sub 0} and the direction of the mean flow within a single data set. Examples obtained around solar minimum using Ulysses data at high latitudes and Stereo data for high-speed streams in the ecliptic plane show that the spectral exponent in the inertial range varies nearly monotonically from approximately 1.6 when B{sub 0} is perpendicular to the flow to 2.0 when B{sub 0} is parallel to the flow, roughly consistent with anisotropic theories of incompressible MHD turbulence. This and other new information about the 3D wavector spectrum of solar wind fluctuations in the inertial range and the dissipation range are briefly discussed.

• OSTI ID: 21371705
• Journal Information: AIP Conference Proceedings, Vol. 1216, Issue 1; Conference: 12. international solar wind conference, Saint-Malo (France), 21-26 Jun 2009; Other Information: DOI: 10.1063/1.3395817; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANISOTROPY
ASTROPHYSICS
ENERGY SPECTRA
FLUCTUATIONS
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
SOLAR WIND
SPACE VEHICLES
TURBULENCE
VELOCITY
WAVE EQUATIONS
DIFFERENTIAL EQUATIONS
EQUATIONS
FLUID MECHANICS
HYDRODYNAMICS
MECHANICS
PARTIAL DIFFERENTIAL EQUATIONS
PHYSICS
SOLAR ACTIVITY
SPECTRA
STELLAR ACTIVITY
STELLAR WINDS
VARIATIONS
VEHICLES