Morphological studies of rising equatorial spread F bubbles

Details Morphological studies of rising equatorial spread F bubbles Morphological studies of rising equatorial spread F bubbles

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2085o&link_type=abstract

Journal of Geophysical Research, vol. 83, May 1, 1978, p. 2085-2090. Research supported by the U.S. Defense Nuclear Agency and

Physics

23

Bubbles, Plasma Density, Spread F, Tropical Regions, Vertical Motion, Atmospheric Density, Barium Ion Clouds, Electric Fields, Flow Velocity, Morphology, Taylor Instability

Scientific paper

The collisional Rayleigh-Taylor regime is used as a context within which to interpret the shapes and vertical rise rates of equatorial spread-F bubbles (plasma density depletions). The interpretation draws on the analogy between the plasma density depletions and barium clouds (plasma density enhancements). Both linear and nonlinear models of the bubble rise velocity are given; the rise velocity may be expressed in terms of the ion-neutral collision frequency and an increasing function of the fractional density depletion (dependent on bubble shape). The models predict large vertical rise velocities for high-altitude bubbles and/or for bubbles with large-percentage plasma depletions.

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