Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa22a..07f&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA22A-07
Physics
[2415] Ionosphere / Equatorial Ionosphere, [2427] Ionosphere / Ionosphere/Atmosphere Interactions, [3319] Atmospheric Processes / General Circulation, [3389] Atmospheric Processes / Tides And Planetary Waves
Scientific paper
During sudden stratospheric warmings (SSWs) the middle atmosphere winter polar vortex rapidly evolves from a fairly zonally symmetric circulation to either a displaced or split vortex, or some combination thereof. The altered circulation and temperature structure subsequently influences the vertical propagation of tidal modes from their sources in the troposphere and stratosphere. The analysis of a small number of events simulated by the Whole Atmosphere Model (WAM) is already showing an apparent consistency in the tidal response in the lower thermosphere in spite of the very different evolution of stratospheric planetary wave fields. In particular, the migrating terdiurnal tide appears to increase in amplitude in the lower thermosphere. The increase is such that it can rival the amplitude of the more typical semidiurnal wind fields. WAM output has been fed into the Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) model to analyze the electrodynamic response to several SSWs with a goal of exploring the physical processes in the connections between terrestrial and space weather. The dynamo action of the wind fields drives a change in the diurnal variation of the electrodynamics. The phase of the upward plasma drift at the magnetic equator typically moves to earlier local times with an increasing magnitude, and then gradually returns to later local times as the amplitude also gradually diminishes in a matter of a few days. Built on an operational weather prediction model, WAM offers the capability to forecast the effects of lower atmosphere dynamics on the ionosphere several days in advance.
Akmaev Rashid A.
Araujo-Pradere Eduardo A.
Fang Taotao
Fedrizzi Michele
Fuller-Rowell Tim J.
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