Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa21b..04h&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA21B-04
Physics
2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2447 Modeling And Forecasting
Scientific paper
Equatorial spread F (ESF) is a low-latitude ionospheric phenomenon that leads to the development of large scale electron density depletions that adversely affect communications and navigation systems. The development of models to understand and predict the onset and evolution of ESF is therefore critically important to a number of space-based systems. To this end, two new simulation codes have been developed at the Naval Research Laboratory to model equatorial spread F. One code uses an 8th order spatial interpolation scheme and the partial donor cell method as a flux limiter which allow simulation studies with very low numerical diffusion. We present results of the dynamics of equatorial spread F that exhibit multiple bifurcations, secondary structure development, and high speed flows within low density channels. We compare these results to all-sky images and radar data. The second code is based upon the NRL ionosphere model SAMI3 and includes coupling to the E region via field-aligned integrated conducitivities. We show the impact of E region coupling on the evolution of ESF. Research supported by ONR.
Huba Joseph D.
Joyce Geoffrey
Swisdak Michael
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