Simulated 2-day Planetary-Wave Signatures in the Ionospheric Dynamo Region.

Details Simulated 2-day Planetary-Wave Signatures in the Ionospheric Dynamo Region. Simulated 2-day Planetary-Wave Signatures in the Ionospheric Dynamo Region.

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa41b0714l&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA41B-0714

Physics

2427 Ionosphere/Atmosphere Interactions (0335), 2437 Ionospheric Dynamics, 2447 Modeling And Forecasting, 3367 Theoretical Modeling, 3384 Waves And Tides

Scientific paper

A quasi-two-day (QTD) oscillation is known to exist in ionospheric peak densities, peak heights and ground magnetic perturbations due to E-region currents. Several mechanisms have been proposed to explain these observations, including (1) QTD modulation (in the stratosphere and mesosphere) of upward- propagating semidiurnal tides that generate E-fields via the wind dynamo; (2) vertical penetration of the QTD wave into the E-region (due to QTD filtering effects on upward-propagating gravity waves that are dissipated and deposit momentum in the E-region) and subsequent dynamo generation of E-fields; and (3) dynamical effects of the QTD wave on the [O]/[N2] ratio. A new time-dependent nonlinear model has been developed which is capable of examining the viability of mechanisms (1) and (2) in explaining existing ionospheric observations. In this work, first results from the model are presented, with particular emphasis on examining the efficiency of dynamo electric field generation directly by QTD wave penetration into the E-region.

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