Physics – Plasma Physics
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11403109s&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue A3, CiteID A03109
Physics
Plasma Physics
4
Solar Physics, Astrophysics, And Astronomy: Celestial Mechanics, Solar Physics, Astrophysics, And Astronomy: Corona, Magnetospheric Physics: Auroral Phenomena (2407), Space Plasma Physics: Chaos (4420), Space Plasma Physics: Particle Acceleration
Scientific paper
We have investigated the nonlinear interaction between inertial Alfvén waves and ion-acoustic waves by numerical simulation and showed that the system becomes more chaotic and turbulent as it evolves. The nonlinear dynamical equation satisfies modified Zakharov type of equations by taking the nonadiabatic response of the background density. The evolution of density cavities corresponding to magnetic field coherent structures are found at different times. The deepest density depletion, which is accompanied by most intense magnetic fields, has the density fluctuations of ~0.4n 0 and ~0.6n 0 (n 0 is electron number density) for auroral and coronal plasmas, respectively. As a result of the ponderomotive force, the magnetic field is trapped in the regions of low density. The power spectrum of magnetic field fluctuations indicates that the nonlinear interactions may be distributing energy among higher wave numbers.
Sharma R. P.
Singh Heisnam Dinachandra
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