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== 10 Meters HAM Allocation ==== 10 Meters HAM Allocation (Part 97) ==== Skip Phenomena ==The "solar wind", generated by the sun's explosions, impacts the earth's upper atmosphere, called the ionosphere. When it does, ionized layers (called "F2" and "F1") form in the ionosphere between about 100 and 300+ miles above the earth's surface. The "F2" layer acts like a mirror to a 10 meter radio signal. The "F2" reflects the signal back to earth, thousands of miles beyond your antenna.The part of the earths atmosphere called the ionosphere is divided into three layers. The three layers are, from lowest to highest, the D layer, the E layer, and the F layer. Each layer has a different effect on HF radio propagation. The F layer is the highest layer and it is divided into two levels: F1 and F2. At night the F1 and F2 merge into one layer. During the day, the F1 layer doesnt play a part in radio propagation, but F2 does. It is responsible for most high-frequency long distance propagation on 20 meters and above. In years with high sunspot numbers, worldwide contacts can be made easily on 20 through 10 meters by F2 layer propagation. [[Category:Electronics]][[Category:Radio]][[Category:Ham Radio]][[Category:Amateur Radio Band]]