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In a recent study, a process for the generation of Extremely Low Frequency (ELF) waves in the range of 1–12 Hz produced by diamagnetic currents generated by heat in ionosphere by high frequency (HF) waves has been proposed. HF waves that reach the ionosphere can be generated, for example, on the Earth's surface by the High Frequency Active Auroral Research Program (HAARP) instruments or solar processes...
As a consequence of their large size and surface geometry, military transport helicopters have usually large radar cross sections (RCS). Depending on the type of the mission these helicopters are carrying, it would be advantageous for the helicopter to have a smaller RCS. The RCS of any target can be minimized using different methods. In this study, the RCS of a helicopter was simulated assuming that...
The ionospheric slab thickness is a measure of the shape of the ionospheric profile and can be obtained from the ratio of total electron content (TEC) to the F-region peak electron density (NmF2). In this study the ionospheric slab thickness was obtained during one year of extremely low solar activity (from March 2009 to February 2010). The period analyzed were separated in three seasonal groups:...
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