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Science 12 April 1968:
Vol. 160. no. 3824, pp. 181 - 184
DOI: 10.1126/science.160.3824.181
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Articles

Satellite Ionosonde Records: Resonances Below the Cyclotron Frequency

R. E. Barrington 1 and T. R. Hartz 1

1 Defence Research Telecommunications Establishment, Ottawa, Canada

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.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)