Time evolution and dynamics of equatorial backscatter plumes. I - Growth phase

Physics

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Backscattering, Equatorial Atmosphere, F Region, Plumes, Space Plasmas, Time Response, Ionospheric Electron Density, Rayleigh Scattering, Satellite Observation, Taylor Instability, Very High Frequencies

Scientific paper

The growth of equatorial VHF backscatter plumes, which can be used to study the development of small-scale F region irregularities as well as plasma bubbles, is analyzed on the basis of radar measurements. The development of selected plumes was monitored by the use of the ALTAIR fully steerable backscatter radar located in the Kwajalein Atoll, Marshall Islands. Three examples of the growth-phase characteristics of backscatter plumes are presented which illustrate the generation of the plumes in the bottomside of the F layer about the time of F layer sunset. Observations are found to be generally consistent with equatorial irregularity generation as predicted by the Rayleigh-Taylor and gradient drift instabilities, however an east-west asymmetry in backscatter strength found in the bottomside F layer suggests the importance of the eastward neutral wind and altitude modulation of the bottomside F layer in establishing the initial conditions for plume growth.

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