[en] Measurements of the location of sources of terrestrial kilometric radiation obtained with the lunar orbiting Radio Astronomy Explorer-2 satellite have revealed a class of emission associated with the cusp and dayside magnetosheath. At frequencies near 250 kHz this emission is observed at radial distances between 2 and 20 R/sub E/ at magnetic latitudes of 75 deg to 80 deg and is most often detected during periods of auroral activity (AE approximately = 250) and southward orientation of the interplanetary magnetic field vertical component. During very disturbed times, the emission at the lowest frequencies (< or approximately= 200 kHz) appears to come from the dayside magnetosheath at distances approximately = 12 R/sub E/. Whenever the geomagnetic dipole is tilted significantly with respect to the ecliptic pole (> or approximately = 10 deg) the cusp emission is confined to the hemisphere containing the subsolar point. The measurements also suggest that the region of cusp emission is rather narrowly confined in longitude to within +- a few hours of the noon meridian