Short-Term TEC Perturbations Associated With Planetary Waves Occurrence in the Ionosphere

Details Short-Term TEC Perturbations Associated With Planetary Waves Occurrence in the Ionosphere Short-Term TEC Perturbations Associated With Planetary Waves Occurrence in the Ionosphere

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33a1624s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA33A-1624

Physics

2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2441 Ionospheric Storms (7949), 2736 Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

Analysis of TEC response to storm showed short-term perturbations which were observed after initial phase of geomagnetic storms. The perturbations demonstrated very well expressed latitudinal structure and were recognized on diurnal variations as surges of TEC enhancement of TEC. Ordinary such storm-time positive effect was associated with TAD. Duration of the perturbations was about 2-4 hours and their amplitude increased toward low latitudes. Such TEC perturbations have the longitudinal dependence. It is important that time location of surges have week dependence on latitude. The observed structure appeared to arrive from high latitudes, but at middle latitudes it was represented as a standing wave. It is assumed that such TEC perturbations can be produced due to superposition of the eastward and westward propagating planetary Poincare waves. The periods of these waves are usually several hours. Poincare waves can be excited at the atmosphere in storm time. At middle latitudes their superposition is as standing wave that forms observing TEC perturbations. In the report, the possibilities of application Poincare waves to the ionosphere dynamics studies are discussed and an explanation of the observed ionospheric effects is given.

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