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Plasma Wave Experiment (WAVE)

NSSDCA ID: 1992-064A-05

Mission Name: Freja
Principal Investigator:Mr. Bengt Holback


The experiment carried a number of sensors, all mounted in the spin plane. Three pairs of 6 cm diameter spherical probes (P1-P6) were mounted at the end of 15 or 7.5 meter wire booms, each probe carrying its preamps also. P1 and P2 are for electric field measurement only, and the rest were switchable between field (voltage) and plasma (current) modes. P1 and P2 were used as HF sensors, in addition to a dedicated pair of 2.5 cm diameter probes mounted on 0.6 meter booms. One of these shorter booms also carried a search coil magnetometer, with one coil parallel to spin axis and the remaining in the spin plane (i.e, one radial and another tangential in the spin plane). Finally, the other shorter boom also carried a cylindrical Langmuir probe, CYLP; the axis of the cylinder pointed to the sun along the spin axis, to minimize photoelectron emission. The sensitivities and frequency coverage of the different sensors were as follows. (1) HF:0.000100 - 0.6 V, 100 kHz-4.0MHz; 0.000002-0.025 V, 20 kHz-1.0 MHz. (2) MF/LF E-field:0.000004 - 1.0 V, 1.0 Hz - 10.0 Hz. (3) MF/LF B-field: 10 micronano Tesla/SQRT(Hz), 30 Hz-10 kHz. (4) Plasma density fluctuations, (Delta N)/N: 0.01% to 50%, 1.0 Hz-1.5 kHz. (5) Temperature fluctuations, (Delta T)/T: TBD, 1.0 Hz-1.5 kHz. (6) Plasma density: N = 1.0 - 60,000 /cc, 0.0 Hz-40 Hz. (7) Electron Temperature: TBD, 0.0 Hz - 40 Hz. Telemetry rate constraints made it difficult to transmit all sampled data; typically only 0.01% of the HF samples, 1.6% of MF samples, and 18.8% of the LF samples could be telemetered, though special situations enabled enhanced telemetering allocations. The instrument is inoperative since 20 June 1995.

Alternate Names

  • Freja/WAVE
  • WAVE

Facts in Brief

Mass: 8.27 kg
Power (avg): 10.6 W
Bit rate (avg): 75.776 kbps

Funding Agency

  • Unknown (Sweden)


  • Space Physics: Ionospheric Studies
  • 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. Alv A. EgelandCo-InvestigatorUniversity of
Dr. Michael C. KelleyCo-InvestigatorCornell
Dr. Carl O. BostromCo-InvestigatorSwedish Institute for Space Physics
Dr. Eigil UngstrupCo-InvestigatorDanish Space Research
Dr. Gerhard HaerendelCo-InvestigatorMax-Planck-Institut fur Extraterrestrische
Dr. Jan A. HoltetCo-InvestigatorUniversity of
Dr. Georg GustafssonCo-InvestigatorSwedish Institute for Space
Dr. Paul M. KintnerCo-InvestigatorCornell
Mr. Gunnar HolmgrenCo-InvestigatorSwedish Institute for Space
Dr. Alain RouxCo-InvestigatorCentre National d'Etudes des
Dr. Herve de FeraudyCo-InvestigatorCNRS-Centre de Recherches en Physique de l'Environment Terrestre et
Dr. Kristof StasiewiczCo-InvestigatorSwedish Institute for Space Physics
Dr. Hannu KoskinenCo-InvestigatorFinnish Meteorological
Mr. Mats AndreCo-InvestigatorSwedish Institute for Space Physics
Mr. Bengt HolbackPrincipal InvestigatorSwedish Institute for Space
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