Numerical Investigation Of Sporadic-e Layer Formation In Midlatitude

In this thesis numerical investigation of wind shear theory, which is responsiblernfor the formation of sporadic-E layers in midlatitude is presented. Numerical investigationrnof sporadic-E layers were pursued since the late 1960s. However, numerical modellingrnefforts were limited due to lake of input parameters. A recent rocket observation fromrnWallops Island Flight Facility (WIFF), VA (37.84 N, 75.48 W) of sporadic-E layers is usedrnin this investigation. In this observation secondary peaks other than sporadic-E layersrnwere observed unlike previous campaigns, which could question the validity of wind shearrntheory. Numerical investigation confirms that tidal winds are responsible for the formationrnof dense ion layers in the 90-130km height region. It is demonstrated that the assumedrnsources of transport mechanisms actually form E-region layer densities similar to thosernobserved. The numerical investigation also shows that zonal and meridional winds andrnelectric fields each play distinct roles in local transport and formation of secondary peaks

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