Nonlinear theory of type I irregularities in the equatorial electrojet

By taking into account the effect of wave electric fields on electron orbits, a nonlinear dispersion relation for Type I irregularities is obtained which predicts: (1) isotropy of the Doppler shift with elevation, (2) limiting phase velocity equal to ion acoustic speed, and (3) saturation amplitude which is maximum for horizontally propagating waves and decreases with elevation.

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