Excitation of Equatorial Ionospheric Bubbles from Tropospheric Convection-Driven Gravity Waves

Details Excitation of Equatorial Ionospheric Bubbles from Tropospheric Convection-Driven Gravity Waves Excitation of Equatorial Ionospheric Bubbles from Tropospheric Convection-Driven Gravity Waves

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa11a1500k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA11A-1500

Statistics

Methodology

2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities, 2471 Plasma Waves And Instabilities (2772)

Scientific paper

Using numerical simulation techniques, the triggering of equatorial ionospheric bubbles from tropospheric convection-driven gravity waves is studied. The evolution of the ionospheric bubbles is achieved using a 3D time-dependent nonlinear plasma fluid model. This model solves the 3D equations for ionospheric plasma continuity, momentum, and current continuity and incorporates inertial effects, off-equatorial Pedersen conductivity effects, vertical drifts from zonal electric fields, large scale background thermospheric winds, and gravity-wave (GW) wind effects. The gravity wave winds, wavelengths, and periods are derived from a recent model of tropospheric convection-driven gravity wave generation. The thermospheric GW model is developed using a ray tracing methodology and includes both viscosity and thermal conduction damping. In order to compute the time-dependent ionospheric bubble evolution we incorporate a spectrum of GWs with vertical and horizontal wavelengths and wave periods derived from the thermospheric GW model. Initial studies show that equatorial ionospheric bubbles can be triggered using the thermospheric GW model for a range of GW amplitudes and scale sizes. Comparison with satellite and radar observations are made.

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