Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa14a..01h&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA14A-01
Physics
2415 Equatorial Ionosphere, 2419 Ion Chemistry And Composition (0335), 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities
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, NRL has developed a three-dimensional model of ESF. The global NRL ionosphere model SAMI3 has been modified to simulate a narrow wedge of the post-sunset ionosphere to capture the onset and evolution of ESF. Preliminary results indicate that (1) bubbles can rise to ~ 1600 km, (2) extremely steep ion density gradients can develop in both longitude and latitude, (3) upward plasma velocities approach 1 km/s, and (4) the growth time of the instability is ~eq 15 min. We will also report the effects of meridional and zonal winds on bubble development, as well as ion composition (both atomic and molecular). The simulations will focus on current, low solar activity conditions, and results will be compared to C/NOFS data where available. Research supported by ONR
Huba Joseph D.
Joyce Geoffrey
Krall Jonathan
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