title: Satellite ionosonde records: resonances below the cyclotron frequency.
abstract: Resonant responses observed by the topside ionosonde in the Canadian satellite Alouette II are examined. In addition to the well-known plasma resonances, several subsidiary resonances are identified below the electron cyclotron frequency. Their patterns of occurrence are not consistent with a suggested explanation of induced magnetic dipole radiation; rather they appear to result from harmonic stimulation of the plasma resonances and beat-frequency generation.
authors.forename: R E
authors.initials: RE
authors.lastname: Barrington
authors.forename: T R
authors.initials: TR
authors.lastname: Hartz