Radiophysics and Quantum Electronics

, Volume 42, Issue 7, pp 544–556

Influence of small-scale irregularities on the features of the overshoot effect in the temporal evolution of stimulated electromagnetic emission. Part I. Development stage


  • E. N. Sergeev
    • Radiophysical Research Institute
  • S. M. Grach
    • Radiophysical Research Institute
  • G. P. Komrakov
    • Radiophysical Research Institute
  • V. L. Frolov
    • Radiophysical Research Institute
  • P. Stubbe
    • Max-Planck Institut für Aeronomie
  • B. Thidé
    • Institute of Space Physics
  • T. Leyser
    • Institute of Space Physics
  • T. Carozzi
    • Institute of Space Physics

DOI: 10.1007/BF02677560

Cite this article as:
Sergeev, E.N., Grach, S.M., Komrakov, G.P. et al. Radiophys Quantum Electron (1999) 42: 544. doi:10.1007/BF02677560


We present the results of experimental studies of the evolution of stimulated electromagnetic emission of the ionosphere (SEE) under the F-layer modification by powerful HF radio waves in a broad range of the pump wave frequencies. We compare the parameters of the overshoot effect in SEE evolution to the observations of anomalous attenuation and field-aligned scattering of radio waves. We show the overshoot effect to result from the anomalous attenuation under scattering at artificial small-scale ionospheric irregularities. We found the characteristic time scales of the overshoot effect development to decrease and its value to increase as the pump wave frequency decreases from 6 to 4 MHz; this is attributed to the observed increase of the irregularities amplitude at scales\(l \bot \sim 3 - 10m\) m.

Copyright information

© Kluwer Academic/Plenum Publishers 1999