Physics – Plasma Physics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11408106g&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue A8, CiteID A08106
Physics
Plasma Physics
1
Space Plasma Physics: Turbulence (4490), Space Plasma Physics: Nonlinear Phenomena (4400, 6944), Space Plasma Physics: Wave/Wave Interactions, Nonlinear Geophysics: Turbulence (3379, 4568, 7863), Nonlinear Geophysics: Cascades
Scientific paper
Motivated by apparently contradictory reports of turbulence and discrete frequency wave-like signals in the interplanetary medium, we employ numerical simulations to investigate the persistence of wave-like spatial structures in the presence of strong low-frequency turbulence. We seek to identify the time scales and other conditions that permit them to remain as identifiable structures in the turbulent medium. The wave-like structures are initialized as discrete modes in wave number in a series of spectral method magnetohydrodynamic turbulence computations. We find that discrete modes can survive from one to many nonlinear times and that the main factor that determines their survivability is the separation from turbulence in parallel wave number. This corresponds to a separation in their corresponding Alfvén mode frequency.
Ghosh Sabyasachi
Lanzerotti Louis J.
Matthaeus William H.
Thomson David J.
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