F2 Layer

The F2 layer refers to the highest region of the ionosphere, located approximately 200 to 400 kilometers above the Earth’s surface. In ham radio terminology, the F2 layer plays a crucial role in long-distance communication by reflecting radio waves back to the Earth’s surface. It is particularly significant for HF (High Frequency) communication, where signals are refracted back to the Earth, enabling global communication. The F2 layer’s density and height vary based on solar activity and time of day, influencing propagation conditions for radio operators.