Morphological Studies of Rising Equatorial Spread F Bubbles
NAVAL RESEARCH LAB WASHINGTON DC
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Analytical electrodynamic morphological studies of rising equatorial Spread F bubbles, within the context of the collisional Rayleigh-Taylor regime, are presented. The analogy between bubbles plasma density depletions and barium cloudsplasma density enhancements is noted. Bubbles tend to steepen on their top and elongate in the vertical direction and they narrow horizontally as they rise through the equatorial F region ionosphere. Linear and nonlinear models of constant shape bubbles are presented. It is shown, for these models that the vertical bubble rise velocity, V sub B gupsilon sub in fdelta nn sub o, where upsilon sub in is the ion-neutral collision frequency and f is an increasing function of delta nn sub o fractional density depletion, depending on the shape of the bubble. Consequently, high altitudes andor large percentage plasma depletions yield large vertical bubble rise velocities. The models are extended to include arbitrary electric fields in addition to the gravitational force.
- Atmospheric Physics
- Plasma Physics and Magnetohydrodynamics