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Controlled and Naturally Occurring Wave Particle Interactions Theory

NSSDCA ID: 1981-070A-08

Mission Name: Dynamics Explorer 1
Principal Investigator:Prof. Robert A. Helliwell


This investigation used a ground-based very-low-frequency/low-frequency (VLF/LF) (0.5-200 kHz) transmitter located at Siple, Antarctica, at an L value of about 4, and the broad-band magnetic field detector from experiment 81-070A-02. The primary objective of the investigation was to determine the relationship between VLF/LF waves and energetic electrons in the magnetosphere, with emphasis on wave growth, stimulated emissions, and wave-induced perturbations of the energetic electrons. Other objectives were (1) to determine how wave propagation from both ground and magnetospheric sources was affected by field-aligned plasma structures such as the plasmapause and ducts of enhanced ionization, (2) to use the wave data to describe the structure of the plasmapause and the distribution of ionization along field-aligned ducts, and (3) to study the effects of earth power-line radiation and other VLF wave activity. The spacecraft instrumentation for this experiment consisted of the Linear Wave Receiver (LWR) provided by the Plasma Wave Instrument (81-070A-02). The LWR provided a waveform output with a 30-dB linear amplitude response for bands of 1.5-3.0, 3.11 plus or minus 7-1/2%, 3-6, or 10-16 kHz for a selected magnetic or electric sensor. This receiver was used to measure growth rates for waves stimulated by the Siple VLF transmitter or by natural wave phenomena. More details can be found in S. D. Shawhan et al., Space Sci. Instrum., v. 5, n. 4, p. 535, 1981.

Alternate Names

  • Controlled and Naturally-Occurring Wave Particle Interactions
  • DynamicsExplorer1/ControlledandNaturallyOccurringWaveParticleInteractionsTheory


  • Space Physics: Ionospheric Studies
  • Space Physics: Magnetospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Dr. Dieter K. Bilitza



NameRoleOriginal AffiliationE-mail
Dr. Donald L. CarpenterOther InvestigatorStanford
Dr. Joseph B. ReaganOther InvestigatorLockheed Palo Alto
Dr. Chung Gun ParkOther InvestigatorCornell University
Dr. Timothy F. BellOther InvestigatorStanford
Prof. Robert A. HelliwellPrincipal InvestigatorStanford
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