Aspect sensitivity of equatorial electrojet irregularities and theoretical implications

Details Aspect sensitivity of equatorial electrojet irregularities and theoretical implications Aspect sensitivity of equatorial electrojet irregularities and theoretical implications

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94..426k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Jan. 1, 1989, p. 426-434.

Physics

43

Auroral Electrojets, Equatorial Electrojet, Magnetohydrodynamic Stability, Magnetosphere-Ionosphere Coupling, Plasma Waves, Auroral Echoes, Night Sky, Plasma Density, Radio Interferometers

Scientific paper

Multibaseline 50-MHz radar interferometry is used to study the dependence of echo strength on aspect angle, or the angle of arrival relative to the normal of the geomagnetic field, for the case of electrojets. It is noted that, during 'type 1' conditions, a pronounced width variation occurred with Doppler shift; this may be due to nonlinear three-wave mode coupling, which produces a reverse cascade of energy from short wavelengths to long, as well as an increase in the mean aspect angle. Such a cascade represents an effective diffusion coefficient increase for the short-wavelength waves, which may explain the limitation of the type 1 phase velocity at the ion-acoustic velocity.

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