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《Chinese Science Bulletin》 2015-33
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Tidal spectrum analysis of electron density and plasma vertical velocity at mid-latitudes

WANG Hui;LIU DingWei;Department of Space Physics,School of Electronic Information,Wuhan University;State Key Laboratory of Space Weather,Chinese Academy of Sciences;  
This study investigates the global magnetic local time versus longitudinal pattern of electron density(Ne) and vertical plasma velocity induced by the zonal wind(Vz) at mid-latitudes.The tidal signatures of both Ne and Vz are analyzed by using CHAMP observations.DE1(D0) are major diurnal tidal component for the large scale wave-2 and wave-1 structures in both Ne and Vz in the Northern and Southern Hemispheres.The tidal amplitudes of Ne and Vz exhibit hemispheric asymmetries,i.e.,larger in the south than in the north.The global ionosphere-thermosphere model without up-propagating tides can reproduce generally well the observed large scale longitudinal structure of Ne.This supports the important role of in situ physical processes.The relative amplitudes of the tidal components as well as their seasonal and solar cycle variations of Ne are not always consistent with those of Vz.These discrepancies suggest that there exist other mechanisms that can modulate the longitudinal distribution of Ne,which should be considered in the future work.
【Fund】: 国家自然科学基金(41222030;412221003;41431073)资助
【CateGory Index】: P352
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