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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 111,
A12108,
9 PP., 2006
doi:10.1029/2006JA011759
Alfvén wave filamentation and particle acceleration in solar wind and magnetosphere
Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi, India
Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi, India
Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi, India
We present numerical simulations of Alfvén waves in steady state, leading to the formation of intense magnetic filaments when the nonlinearity arises due to the ponderomotive effects and Joule heating. When the plain Alfvén wave is perturbed by a transverse perturbation and the magnitude of the pump Alfvén wave changes, chaotic filamentary structures of magnetic field in kinetic Alfvén wave (KAW) filamentation and quasiperiodic in inertial Alfvén wave (IAW) filamentation have been observed. At higher KAW pump wave amplitude, the spectra approaches near the Kolmogorov k −5/3 scaling. The spectral index becomes k −3 scaling in IAW. Relevance of these studies in solar wind and magnetosphere for KAW and solar corona and auroral region for IAW has also been pointed out. Particle heating in these small-scale filamentary structures has also been calculated by using velocity space diffusion coefficient in Fokker-Planck equation.
Received 1 April 2006; accepted 10 October 2006; published 20 December 2006.
Citation: (2006), Alfvén wave filamentation and particle acceleration in solar wind and magnetosphere, J. Geophys. Res., 111, A12108, doi:10.1029/2006JA011759.
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