F2Schicht
The F2-Schicht, or F2 layer, is the highest-density region of the ionosphere’s F layer, located at altitudes roughly between 250 and 400 kilometers above the Earth's surface. It is primarily formed by solar extreme ultraviolet and X-ray radiation ionizing atomic oxygen, creating a layer with the greatest electron density in the ionosphere. The peak electron density within this layer is described by the parameter hmF2, and the maximum plasma frequency, foF2, determines the highest radio frequency that can be reflected back to Earth from the layer.
The F2 layer is highly variable. During daytime, solar radiation increases ionization and electron density, raising
Because radio waves in the high-frequency band reflect from the F2 layer, it plays a crucial role