Earth–ionosphere waveguide Earth and the ionosphere. The round-the-world nature of the waveguide produces resonances, like a cavity, which are at ~7 Hz. Radio propagation within the ionosphere depends on frequency, angle of incidence, time of day, season, Earth's magnetic field, and solar activity. At vertical incidence, waves with frequencies larger than the electron plasma frequency (f) of the F-layer maximum (1) f = 9 (N) kHz (N in cm is the electron density) can propagate through the ionosphere nearly undisturbed. Waves with frequencies smaller than f are reflected within the ionospheric D-, E-, and F-layers. f is of the order of 8–15
Radio Waves (Eli Young Band song) Radio Waves (Eli Young Band song) "Radio Waves" is a song recorded by American country music group Eli Young Band. It was released in June 2009 as the third single from the album "Jet Black & Jealous". The song reached number 35 on the "Billboard" Hot Country Songs chart. The song was written by Mike Eli and Blu Sanders. "Radio Waves" is an up-tempo song in which the male narrator is reflecting on a past relationship with regret. The narrator sings the song to former lover over the radio, hoping to reconcile the relationship. The song has garnered favorable critical