Impact of Upward Propagating Kelvin Waves on the Thermosphere During Solar Minimum

Details Impact of Upward Propagating Kelvin Waves on the Thermosphere During Solar Minimum Impact of Upward Propagating Kelvin Waves on the Thermosphere During Solar Minimum

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa31b1423c&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA31B-1423

Physics

[0350] Atmospheric Composition And Structure / Pressure, Density, And Temperature, [3369] Atmospheric Processes / Thermospheric Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves, [7969] Space Weather / Satellite Drag

Scientific paper

Kelvin waves are eastwards propagating planetary waves that are excited sporadically in the lower atmosphere by tropical convective activity. Ultra Fast Kelvin (UFK) waves have periods in the range of 2 - 4 days, and vertical wavelengths in the range of 40 km or more. Past observations and modeling studies have shown that such UFK waves are capable of penetrating well into the thermosphere and ionosphere due to their long vertical wavelengths, where they may modulate phenomena occurring in this region. This upwards coupling has the potential to be a significant source of thermospheric variability, particularly in the absence of geomagnetic drivers. A sensitivity study has been conducted to examine the effect of an Ultra Fast Kelvin wave on the thermosphere and ionosphere using the NCAR Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model (TIME GCM). Changes in the ionosphere and thermosphere above 200 km resulting from a UFK wave forced from the model lower boundary are identified under background atmospheric conditions corresponding to solstice and equinox during the solar minimum. Potential mechanisms that may serve to couple the UFK wave to the ionosphere and thermosphere such as UFK wave modulation of gravity wave diffusivity are also examined.

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