Numerical Investigation of Sporadic-E Layer Formation in Midlatitude
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Date
2007-07
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Addis Ababa University
Abstract
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
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Keywords
E Layer Formation in Midlatitude