Three-Dimensional Simulation of the Coupled Perkins and Es-Layer Instabilities in the Nighttime Midlatitude Ionosphere

Details Three-Dimensional Simulation of the Coupled Perkins and Es-Layer Instabilities in the Nighttime Midlatitude Ionosphere Three-Dimensional Simulation of the Coupled Perkins and Es-Layer Instabilities in the Nighttime Midlatitude Ionosphere

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa52a..10y&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA52A-10

Physics

2427 Ionosphere/Atmosphere Interactions (0335), 2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting, 2471 Plasma Waves And Instabilities (2772)

Scientific paper

Plasma density structures and associated irregularities in the nighttime midlatitude ionospheric E and F regions are frequently observed as frontal structures elongated from northwest to southeast (NW-SE) in the northern hemisphere. The frontal structures and the coupling process between the E and F regions are studied with a three-dimensional numerical model which can simulate two instability mechanisms: Perkins instability in the F region and sporadic-E (Es)-layer instability in the E region, both of which have directional preference which can account for the NW-SE structure. Applying sinusoidal perturbation on an Es layer, it is confirmed that the fastest growth of the coupled instability occurs when the unstable conditions on NW-SE perturbation are satisfied in both regions. The perturbation of F-region integrated conductivity grows much faster than the isolated Perkins instability. The predominant process in the coupled system depends on the ratio of integrated Hall to Pedersen conductivity. A larger Hall conductivity given by an Es layer is important for growth of the coupled instability as well as the Es-layer instability itself. NW-SE structure in the E region can be formed from random perturbation regardless of the F-region condition. When the F region is unstable on NW-SE perturbation, however, the Es-layer instability is reinforced through the coupling process, and the NW-SE structure is formed in both regions with a common scale length which is attributed to the Perkins instability. We conclude that (1) the Es-layer instability plays a major role in seeding NW-SE structure in the F region, and the Perkins instability is required to amplify its perturbation, and (2) the coupling process has a significant effect on the scale of the Es-layer perturbation rather than the growth speed of the Es-layer instability.

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