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Langmuir Probe

NSSDCA ID: 1971-109A-01

Mission Name: Ariel 4
Principal Investigator:Prof. A. Peter Willmore


The electron density measurements were obtained using a double Langmuir probe (capacitance probe) consisting of two plane rectangular grids operated at a probing frequency of 39 MHz. The dc potential of the grids was swept relative to the satellite potential. Two logarithmic amplifiers were used, and electron densities were measured from 10.E8 to 10.E12 electrons/cubic meter. Further details can be found in C. V. Goodall et al., "Topside ionosphere electron density measurements on Ariel 4.," Proc. Royal Soc., v. A342, p. 189, 1975. The electron temperature measurements were based on a modified Langmuir probe technique. Two probes were used. A constant ratio of current difference between the probes was maintained by automatic adjustment of the voltage difference between the probes.

Alternate Names

  • Ariel4/LangmuirProbe
  • Local Electron Density


  • Space Physics: Ionospheric Studies

Additional Information

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NameRoleOriginal AffiliationE-mail
Prof. A. Peter WillmorePrincipal InvestigatorUniversity of
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