Modeling Low-latitude Ionospheric Structure with New Empirical Velocity Models

Details Modeling Low-latitude Ionospheric Structure with New Empirical Velocity Models Modeling Low-latitude Ionospheric Structure with New Empirical Velocity Models

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa43a..04r&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA43A-04

Other

2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2441 Ionospheric Storms (7949), 2447 Modeling And Forecasting

Scientific paper

Much of the structuring of the low-latitude ionosphere is caused by plasma transport driven by electric fields perpendicular to the geomagnetic field. We illustrate this with modeling studies of two phenomena using new empirical models of the electric field: 1) the effect of penetration electric fields during geomagnetic storms and 2) the longitudinal structure of the equatorial anomaly. The new model for the penetration fields (called the Kelley model) specifies the eastward low-latitude electric field as a scaling of the dawn-dusk interplanetary field. This electric-field model has been used to model the plasma structure and Rayleigh-Taylor instability of the ionosphere in the November 2004 storms and others. We will show that it reproduces a number of different observations of the low-latitude ionosphere quite well. To model the climatology of the longitudinal structure of the equatorial anomaly we use a new empirical plasma drift model determined from a binning of the complete ROCSAT data set of plasma drift measurements. This solar-max model exhibits the four-peak longitudinal structure attributed to the effect of tidal oscillations at lower altitudes on the daytime dynamo. We will present results for total electron content and airglow around the globe demonstrating the strength of their nodal structure as a consequence of transport by this field, and we will look for residual effects of the tidal structure on the strength of the Rayleigh-Taylor instability in the early evening.

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