Computer Science – Sound
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..339k&link_type=abstract
Astrophysical Journal, Part 1, vol. 220, Feb. 15, 1978, p. 339-343, 345.
Computer Science
Sound
7
Auroral Zones, Earth Magnetosphere, Magnetohydrodynamic Flow, Plasma Turbulence, Two Dimensional Flow, Balloon Sounding, Collisionless Plasmas, Electric Fields, Flow Velocity, Navier-Stokes Equation, Power Spectra, Satellite Observation, Solar Wind, Turbulent Flow
Scientific paper
Magnetospheric electric-field power spectral densities measured from high-altitude balloons and the Hawkeye 1 satellite are combined in wavenumber space and exhibit a power-law spectrum with index -1.6 + or -0.3 below a wavenumber of 0.05 reciprocal km and index -2.8 + or -0.3 above 2 reciprocal km. This spectrum agrees with that predicted for the inertial subrange of an isotropic homogeneous two-dimensional fluid and for a two-dimensional plasma when energy enters the system at the spectral knee and there exists a viscous dissipation mechanism at large wavenumbers. The wavelength of the spectral knee corresponds to that of folds and curls in the aurora and may be due to an instability of the auroral particle beams.
Kelley Michael C.
Kintner Paul M.
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