A Time-Dependent Model for the Low-Latitude Ionosphere
Abstract
The theoretical development of a time-dependent, self-consistent model of the low-altitude ionosphere between 200 and 3000 km is presented. This model solves the coupled continuity-momentum and energy equations for an ionosphere composed of two ion species (O+ and H+) and electrons in a quasi- simultaneous manner. Account is taken of effects due to the curvature of the field lines and the inclination of the field line to the vertical. This model allows for electrodynamic drift of the plasma during the day, effects due to the expansion and contraction of the neutral atmosphere, and ion-neutral drag effects, as well as the transfer of momentum through collisions, conduction parallel to B, frictional heating/cooling due to the relative motion between the ions and the neutrals, and effects due to adiabatic expansion and contraction. Modelling capabilities are improved by including more realistic neutral winds and electric fields. The offset in the geographic and geomagnetic poles is allowed for by mapping the neutral winds and time (both organized in the geographic coordinate system) into the magnetic reference frame. Results from this model are shown to reproduce the important physical processes that are unique to the low-altitude ionosphere, such as the depletion of plasma at the magnetic equator due to electrodynamic drifts and diffusion, and the seasonal anomaly. Theses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1988
- Accession Number
- ADA196683
Entities
People
- Gary D. Wells
Organizations
- Air Force Institute of Technology