Thermospheric and Ionospheric Variability during 2006: Nonmigrating Tides in the Presence of Variable Solar Geomagnetic Conditions

Details Thermospheric and Ionospheric Variability during 2006: Nonmigrating Tides in the Presence of Variable Solar Geomagnetic Conditions Thermospheric and Ionospheric Variability during 2006: Nonmigrating Tides in the Presence of Variable Solar Geomagnetic Conditions

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa22a..03h&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA22A-03

Physics

[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [3369] Atmospheric Processes / Thermospheric Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

In recent years numerical experiments demonstrated that longitudinal variations observed in the geomagnetically quiescent thermosphere and ionosphere can be attributed to nonmigrating tides of tropospheric origin. We successfully modeled many of the observed tidal characteristics with the National Center for Atmospheric Research (NCAR) thermosphere-ionosphere-mesosphere-electrodynamics general circulation model (TIME-GCM). Little is known about how the intermittent occurrence of quasi-stationary planetary waves or moderate geomagnetic activity may impact these effects. In this presentation, we highlight results from a new year-long TIME-GCM simulation that accounts for the tropospheric, solar and geomagnetic conditions that prevailed during 2006. We quantify the role of direct tidal penetration, electrodynamic coupling, and wave-tide interactions in the longitudinal variability simulated in the TIME-GCM upper atmosphere. We investigate how nonmigrating tides precondition the thermospheric and ionospheric responses to solar geomagnetic storms, and use additional results from our control simulations to examine upper atmospheric nonmigrating tidal signatures in the presence of geomagnetic disturbances.

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