Physics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10320749h&link_type=abstract
Journal of Geophysical Research, Volume 103, Issue A9, p. 20749-20760
Physics
7
Ionosphere: Ionospheric Irregularities
Scientific paper
Two-dimensional numerical simulations of type II irregularities, attributed to gradient-drift instabilities, are carried out with observed profiles in the daytime equatorial electrojet. Earlier work has shown that these profiles are linearly unstable to gradient-drift modes with peak growth rates at wavelengths of the order of 1 km. The nonlinear evolution of these instabilities leads to saturated turbulent structures, with the linear drive at kilometer-scale wavelengths quenched by a direct energy cascade to short wavelengths that are effectively damped by velocity shear and diffusion. The saturated turbulent structures show quasi-steady 1-2 km horizontal waves, and appear to be quite isotropic in the plane perpendicular to the ambient magnetic field. The electron vertical velocity spectra, constructed from the simulation output, show 1-2 km vertical structures which are qualitatively in accord with recent high-resolution radar observations at the Jicamarca Observatory in Peru.
Bhattacharjee Anirban
Hu Shuang
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