Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa21a1529c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA21A-1529
Physics
0310 Airglow And Aurora, 2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 3332 Mesospheric Dynamics, 3389 Tides And Planetary Waves
Scientific paper
Favored occurrences of Equatorial Counter Electrojets (CEJs) with a quasi 16-day periodicity over Trivandrum (8.5oN, 76.5oE, 0.5oN diplat.), in association with the recent polar Stratospheric Sudden Warming (SSW) events are presented. It is seen that, the Stratospheric Temperature (ST) at ~30 km and Mesopause Temperature (MT) over Trivandrum show some interesting features during the SSW period. The ST showed a sudden cooling prior to the SSW and the MT showed an overall enhancement during the course of the SSW. CEJs having quasi 16-day periodicity occurred during this period. Further, the stratospheric zonal-mean zonal wind at ~30 km as represented by the NCEP-NCAR reanalysis data exhibited a distinctly different pattern over almost all the latitudes during the SSW period. As is known, the stratospheric wind changes in certain phases are conducive for the upward propagation of the westward waves (both gravity and planetary) through it over the equatorial latitudes. In this context, the interaction of such waves with the tidal components at the upper mesosphere and dynamo region is proposed to be responsible for the occurrence of CEJs having planetary wave periods during the recent SSW events. The enhancement in the MT is also believed to be due to the increased wave activity and its subsequent dissipation over upper mesospheric altitudes. This study provides some new insights into the processes that couple the Mesosphere-Lower Thermosphere (MLT) region and manifest globally.
Chandrasekharan V.
Pant Tarun K.
Rajagopal S.
Slanger Tom G.
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