Am. Hamza et Jp. Stmaurice, LARGE ASPECT ANGLES IN AURORAL E-REGION ECHOES - A SELF-CONSISTENT TURBULENT FLUID THEORY, J GEO R-S P, 100(A4), 1995, pp. 5723-5732
We use a recently formulated fluid theory of turbulent Farley-Buneman
waves to study the impact of anomalous transport coefficients on the a
spect angles of large-amplitude waves in the high-latitude E region in
the strong nonlinear regime. The theory is self-consistent and contai
ns all the nonlinearities of the system except for the generation of u
nstable secondary waves through a two-step process, which has been stu
died elsewhere. Our study leads us to conclude that nonlinear processe
s are responsible for an increase in the aspect angles of large-amplit
ude waves through an increase in the scattering of electrons in the di
rection parallel to the geomagnetic field in conjunction with a lack o
f any significant increase in the scattering of electrons by waves in
the plane perpendicular to the geomagnetic field.