Noun
the highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission
Source: WordNetF-layer
During the day, the D and E layers become much more heavily ionized, as does the F layer, which develops an additional, weaker region of ionisation known as the F 1 layer. Source: Internet
At night the F layer is the only layer of significant ionization present, while the ionization in the E and D layers is extremely low. Source: Internet
F layer The F layer or region, also known as the Appleton-Barnett layer, extends from about convert to more than convert above the surface of Earth. Source: Internet
The F layer behaviour is dominated by the complex thermospheric winds. Source: Internet
The F layer consists of one layer at night, but during the day, a deformation often forms in the profile that is labeled F₁. Source: Internet
This sets up a sheet of electric current in the E region which, with the horizontal magnetic field, forces ionization up into the F layer, concentrating at ± 20 degrees from the magnetic equator. Source: Internet