Browsing by Author "Bayru, Kibrom"

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    Numerical Investigation of Sporadic-E Layer Formation in Midlatitude
    (Addis Ababa University, 2007-07) Bayru, Kibrom; Damtie, Baylie (PhD)
    In this thesis numerical investigation of wind shear theory, which is responsible for the formation of sporadic-E layers in midlatitude is presented. Numerical investigation of sporadic-E layers were pursued since the late 1960s. However, numerical modelling efforts were limited due to lake of input parameters. A recent rocket observation from Wallops Island Flight Facility (WIFF), VA (37.84 N, 75.48 W) of sporadic-E layers is used in this investigation. In this observation secondary peaks other than sporadic-E layers were observed unlike previous campaigns, which could question the validity of wind shear theory. Numerical investigation confirms that tidal winds are responsible for the formation of dense ion layers in the 90-130km height region. It is demonstrated that the assumed sources of transport mechanisms actually form E-region layer densities similar to those observed. The numerical investigation also shows that zonal and meridional winds and electric fields each play distinct roles in local transport and formation of secondary peaks