Generation of equatorial ionospheric bubbles in the presence of thermospheric tidal winds and gravity waves

Details Generation of equatorial ionospheric bubbles in the presence of thermospheric tidal winds and gravity waves Generation of equatorial ionospheric bubbles in the presence of thermospheric tidal winds and gravity waves

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa51b1220k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA51B-1220

Physics

[2415] Ionosphere / Equatorial Ionosphere, [2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2439] Ionosphere / Ionospheric Irregularities, [2471] Ionosphere / Plasma Waves And Instabilities

Scientific paper

Equatorial ionospheric bubbles are a major problem in ionosphere-thermosphere coupling physics and space weather. Using numerical simulation techniques, the generation of equatorial ionospheric bubbles in the presence of thermospheric tidal winds and gravity waves is studied. The evolution of the ionospheric bubbles is achieved using a 3D time-dependent nonlinear, compressible 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 smaller scale gravity-wave (GW) wind, temperature, and density effects. The gravity wave winds, wavelengths, and periods are derived from a recent model of tropospheric gravity wave generation. A broadband spectrum of GWs with vertical and horizontal wavelengths and wave periods derived from the thermospheric GW model is used to initialize the 3D ionospheric bubble code. It is found that parallel conductivity effects are important and that zonally propagating gravity waves are needed to excite ionospheric bubbles in the presence of tidal winds. We show that the simulated bubble structures are consistent with observations from the recent SpreadFEX campaign in Brazil.

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