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Determination of dispersion relations in quasi‐stationary plasma turbulence using dual satellite data
Author(s) -
Dudok de Wit T.,
Krasnosel'skikh V. V.,
Bale S. D.,
Dunlop M. W.,
Lühr H.,
Schwartz S. J.,
Woolliscroft L. J. C.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl02543
Subject(s) - physics , wavenumber , dispersion relation , computational physics , satellite , dispersion (optics) , turbulence , wavelet , geophysics , spacecraft , wave propagation , meteorology , optics , astronomy , artificial intelligence , computer science
The joint frequency‐wavenumber spectrum is one of the basic quantities for analyzing plasma turbulence. It is shown how the full spectrum can be recovered from wavefields measured by two or more satellites via spectral methods based on wavelet transforms. Compared to standard cross‐correlation techniques, different branches in the dispersion relation can be resolved and quasi‐stationary wavefields can be accessed. Using this new approach, low frequency magnetic field data from the AMPTE‐UKS and AMPTE‐IRM spacecraft are investigated and the impact of nonlinear processes on wave propagation at the Earth's foreshock is revealed.