A theoretical study of the lifetime and transport of large ionospheric density structures

Details A theoretical study of the lifetime and transport of large ionospheric density structures A theoretical study of the lifetime and transport of large ionospheric density structures

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9212343s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Nov. 1, 1987, p. 12343-12351.

Physics

17

Ionospheric Disturbances, Plasma Density, Polar Regions, Space Plasmas, Atmospheric Models, Convective Flow, F Region, Interplanetary Magnetic Fields, Plasma Drift, Time Response

Scientific paper

A three-dimensional time-dependent ionospheric model was used to study the spatial and temporal evolution and transport of large-scale high-density ionospheric structures for a range of solar cycle, seasonal, and IMF conditions. Both density depletions and enhancements were considered. It was found that, depending on the IMF, horizontal plasma convection can cause an initial structure to break up into multiple structures of various sizes, to become stretched into elongated segments, or to remain as a single distorted structure. The lifetime of an F-region density structure depends on several factors, including its magnitude, the initial location where it was formed, the season, the solar cycle, and the convection pattern. For example, in summer, the effects of a large density structure can disappear in a few hours or last as long as nine hours, while in winter the effects can persist for 24 hours. The passage of perturbed plasma flux tubes through sunlit and auroral regions can significantly increase the lifetime of plasma enhancements.

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