Accession Number : AD0754771

Title :   Magnetospheric Electron Density Measurements from Upper Hybrid Resonance Noise Observed by IMP-6,

Corporate Author : IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s) : Shaw,Robert R. ; Gurnett,Donald A.

Report Date : DEC 1972

Pagination or Media Count : 46

Abstract : Naturally occurring radio noise at frequencies greater than the electron plasma frequency and less than the upper hybrid resonance frequency and less than the upper hybrid resonance frequency has been observed at relatively low altitudes in the ionosphere by several rocket- and spacecraft-borne radio noise experiments. Since the index of refraction for the extraordinary mode of propagation near the upper hybrid resonance is greater than one, it is generally believed that this noise is produced by Cerenkov radiation from super-thermal electrons. The University of Iowa plasma wave experiment on the IMP-6 spacecraft has detected a similar noise band believed to be associated with the upper hybrid resonance frequency at large radial distances in the magnetosphere. (Author)

Descriptors :   (*MAGNETOSPHERE, ELECTRON DENSITY), CERENKOV RADIATION, RESONANT FREQUENCY, SCIENTIFIC SATELLITES, SPECTRUM ANALYZERS, NOISE(RADIO)

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE