Other
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11610324c&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A10, CiteID A10324
Other
Ionosphere: Ionosphere/Atmosphere Interactions (0335), Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934), Atmospheric Processes: Mesospheric Dynamics, Atmospheric Processes: Thermospheric Dynamics (0358), Atmospheric Processes: Tides And Planetary Waves
Scientific paper
It has long been suggested that the existence of ionospheric oscillations at multiday periodicities can be explained in part, by the penetration of propagating planetary waves into the E region ionospheric dynamo. In this study, global-scale observations of mesosphere and lower thermosphere (MLT) temperatures from TIMED/SABER and total electron content (TEC) results from GPS derived global ionosphere maps are examined for signs of potential upward planetary wave coupling, around the time of an intense quasi 2 day wave (QTDW) event in the MLT region during 1 December 2005 to 28 February 2006. The periodicity and zonal wave number of westward 3 (W3) and westward 2 (W2) QTDWs are resolved continuously in equatorial ionization anomaly (EIA) latitude TEC values at the same times as corresponding QTDW events in SABER temperatures. Additionally, signatures of an E1 ultrafast Kelvin (UFK) or inertia-gravity wave with period around 60 h (2.5 d) are also resolved. While the TECs also show signs of geomagnetic activity, the coherence and consistency of the aforementioned disturbances between the MLT and the ionosphere suggest that they cannot be attributed to geomagnetic forcing. We find that such propagating planetary waves can produce transient variability of the EIAs, though the effectiveness and hemispheric symmetry of such coupling also depends on factors other than the maximum planetary wave amplitude in the MLT.
Chang Loren C.
Liu Jann-Yenq
Palo Scott E.
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