Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3595s&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 21, p. 3595-3598
Physics
2
Ionosphere: Ionospheric Irregularities, Ionosphere: Modeling And Forecasting, Ionosphere: Plasma Convection, Ionosphere: Polar Cap Ionosphere
Scientific paper
The modeling of ionospheric plasma density irregularities (ΔN/N) is a necessary first step towards forecasting ionospheric scintillation effects. This modeling challenge is difficult not only because the linear-nonlinear saturation levels of instabilities are not completely understood but also because ΔN/N often evolves on time scales which are long compared to the characteristic time constants of the instability drivers. In this study, the linear 1-D gradient drift instability (GDI) is used in a high latitude simulation of ΔN/N evolution. For the first time snapshots (maps) of ΔN/N are presented demonstrating that it is possible to use a physical model simulation of the ionosphere coupled with a time dependent convection electric field to simulate meso-scale irregularities. It is found that to evaluate the density irregularity in any given location, it is not sufficient to know the instantaneous growth rate; it is necessary to follow the history of the plasma along the convection streamlines.
David Marc
Schunk Robert W.
Sojka Jan J.
Zhu Lijun
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