A theoretical study of the production and decay of localized electron density enhancements in the polar ionosphere

Details A theoretical study of the production and decay of localized electron density enhancements in the polar ionosphere A theoretical study of the production and decay of localized electron density enhancements in the polar ionosphere

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.3245s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 3245-3253.

Physics

23

Auroral Zones, F Region, Ionospheric Electron Density, Polar Caps, Irregularities, Oxygen Ions, Particle Precipitation, Plasma Diffusion

Scientific paper

Uniform convection patterns were introduced into a high latitude time-dependent F region model (HLTD) to study if soft auroral particle precipitation is a necessary precondition to blob formation in the ionosphere. Attention was limited to the conditions leading to the formation of parent blobs (dimensions of at least 10 km) due to plasma instabilities. Consideration was given to the effects of discrete auroral structures and to different O(+) precipitation ionization rate profiles during solar maximum conditions in the thermosphere. Blobs were assumed to be produced on the dayside due to ionization caused by sun-aligned arcs. The simulations indicated that parent blobs would form whenever plasma flux tubes in the ionosphere were exposed to soft particle precipitation lasting more than 10 min. The blobs cease to exist when convected to a region with a high particle production rate where the background particle density exceeds that of the blobs. Conditions wherein either hard or soft particle production can produce blobs are outlined.

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