Editing Ground wave (section)

==Related terms==

Mediumwave and [[shortwave]] reflect off the ionosphere at night, which is known as skywave. During daylight hours, the lower [[D layer]] of the ionosphere forms and absorbs lower frequency energy. This prevents skywave propagation from being very effective on mediumwave frequencies in daylight hours. At night, when the D layer dissipates, mediumwave transmissions travel better by skywave. Ground waves ''do not'' include [[ionosphere|ionospheric]] and [[troposphere|tropospheric]] waves