Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 122, Issue 8, Pages 8831-8846Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017JA023947
Keywords
6-day wave; 6; 5-day wave; ionosphere; thermosphere; planetary wave coupling; atmosphere tides; PW-tidal nonlinear interaction
Categories
Funding
- National Science Foundation (NSF) through CEDAR program [AGS1139048]
- NASA [NNX14AF20G]
- NSF
- NASA [NNX14AF20G, 684502] Funding Source: Federal RePORTER
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Using the thermosphere-ionosphere-mesosphere electrodynamics general circulation model simulations, we investigate the short-term ionospheric variability due to the child waves and altered tides produced by the nonlinear interaction between the 6 day wave and migrating tides. Via the Fourier spectral diagnostics and least squares fittings, the [21h, W2] and [13h, W1] child waves, generated by the interaction of the 6 day wave with the DW1 and SW2, respectively, are found to play the leading roles on the subdiurnal variability (e.g., +/- 10 m/s in the ion drift and similar to 50% in the NmF2) in the F region vertical ion drift changes through the dynamo modulation induced by the low-latitude zonal wind and the meridional wind at higher latitudes. The relatively minor contribution of the [11h, W3] child wave is explicit as well. Although the [29h, W0] child wave has the largest magnitude in the E region, its effect is totally absent in the vertical ion drift due to the zonally uniform structure. But the [29h, W0] child wave shows up in the NmF2. It is found that the NmF2 short-term variability is attributed to the wave modulations on both E region dynamo and in situ F region composition. Also, the altered migrating tides due to the interaction will not contribute to the ionospheric changes significantly.
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