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VLF Plasma Resonances

NSSDCA ID: 1977-029A-05

Mission Name: ESA-GEOS 1
Principal Investigator:Dr. Aubry Michel Petit


This investigation (part of ESA experiment S-300) utilized the 20-m booms (normal to the spacecraft spin axis) as a dipole antenna, and the carbon spheres (part of 77-029A-07, Pedersen) as the receiving element. Frequencies from 0.3 to 77 kHz were employed. On transmission of a VLF signal of limited duration, a transient signal was observed for a much longer period than the pulse length, provided that the spectrum of the transmitted signal included one of the resonance frequencies of the plasma. The ambient plasma density could be inferred from the determination of the resonant frequencies. Received frequencies up to 450 Hz were telemetered directly, and six sweep-frequency analyzers and a digital correlator provided auto-correlations and cross-correlations up to 77 kHz. Bandwidths of 2.5, 5.0, or 10.0 kHz could be selected for the correlator.

Alternate Names

  • ESA-GEOS1/VLFPlasmaResonances
  • S300
  • S301
  • Study of Thermal Plasma

Funding Agency

  • European Space Agency (International)


  • Space Physics: Magnetospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Jacquelyne M. EtchetoOther InvestigatorCentre National d'Etudes des
Dr. Aubry Michel PetitPrincipal InvestigatorCentre National d'Etudes des Telecommunications
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