Gravity wave initiation of equatorial spread F - A case study

Computer Science – Sound

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Equatorial Atmosphere, F Region, Gravity Waves, Ionospheric Sounding, Radar Scattering, Spread F, Backscattering, Electric Fields, Gravitational Effects, Ionospheric Currents, Plumes, Taylor Instability

Scientific paper

It is noted that Jicamarca radar backscatter maps were made during four consecutive nights in March 1979. On the third night, which is discussed in detail, six plumes were generated in clear association with a nearly sinusoidal oscillation of the height of the bottomside of the F layer. The vertical amplitude of the oscillation was several hundred km, and the period approximately 100 min. The plumes were generated when the bottomside of the F layer was either at the highest altitude or in the descending phase of the motion. Families of curves are given which correspond to the solution of the dispersion relation for gravity waves capable of initiating the observed bottomside oscillations via the spatial resonance mechanism. It is concluded that the solutions derived in this way are reasonable, and a criterion for how well matched the gravity wave phase velocity and plasma drift have to be to produce a given perturbation in the ionization density is presented.

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