Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Observation on GEOS-1 of 10.2 to 13.6 kHz ground based transmitter signals

  • 26 Accesses

  • 6 Citations


The Omega transmitter signals on 10.2, 11.33 and 13.6 kHz are frequently observed on GEOS-1 near the end of the pass. The signals show large fluctuations in amplitude and in E/B ratio on a time scale of 0.1 s. The time delay of the signals vary considerably over a period of a few minutes, and often the duration of the received pulses on the dipole antenna is longer than the duration of the transmitted pulses. The propagation aspects of these observations will be discussed on the basis of raytracing calculations from the ground to the vicinity of GEOS-1.

This is a preview of subscription content, log in to check access.


  1. Angerami, J. J.: 1970, J. Geophys. Res. 75, 6115.

  2. Burhans, R. W.: 1974, Electronics 47, No. 18, 90.

  3. Dunckel, N. and Helliwell, R. A.: 1974, Radio Science 12, 821.

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Ungstrup, E., Neubert, T. & Bahnsen, A. Observation on GEOS-1 of 10.2 to 13.6 kHz ground based transmitter signals. Space Sci Rev 22, 453–464 (1978). https://doi.org/10.1007/BF00210880

Download citation


  • Time Delay
  • Transmitter Signal
  • Propagation Aspect
  • Large Fluctuation
  • Transmitted Pulse