Kohl, H.; Kopka, H.; La Hoz, C.; Stubbe, P.: Propagation of artificially excited Langmuir waves in the ionosphere. Radio Science 22, pp. 655 - 661 (1987)
Rietveld, M. T.; Mauelshagen, H.-P.; Stubbe, P.; Kopka, H.; Nielsen, E.: The characteristics of ionospheric heating-produced ELF/VLF waves over 32 hours. Journal Geophysical Research 92, p. 8707 (1987)
Barr, R.; Stubbe, P.; Rietveld, M. T.; Kopka, H.: ELF and VLF signals radiated by the ``Polar Electrojet Antenna'': Experimental results. Journal Geophysical Research 91, pp. 4451 - 4459 (1986)
Barr, R.; Stubbe, P.; Rietveld, M. T.; Kopka, H.: ELF and VLF signals radiated by the "Polar Electrojet Antenna": experimental results. Journal Geophysical Research 91, pp. 4451 - 4459 (1986)
Hanuise, C.; Hedberg, A.; Oksman, J.; Nielsen, E.; Stubbe, P.; Kopka, H.: Comparison between the ionospheric plasma drift and the motion of artificially induced irregularities as observed by HF backscatter radars. Annales Geophysicae 4, p. 49 (1986)
Hedberg, Å.; Derblom, H.; Hamberg, G.; Thidé, B.; Kopka, H.; Stubbe, P.: Measurements of HF backscatter cross section for striations created by ionospheric heating at different power levels. Radio Science 21, pp. 117 - 125 (1986)
Jones, T. B.; Robinson, T. R.; Stubbe, P.; Kopka, H.: EISCAT observations of the heated ionosphere. Journal of Atmospheric and Terrestrial Physics 48, pp. 1027 - 1035 (1986)
Rietveld, M. T.; Kopka, H.; Stubbe, P.: D-region characteristics deduced from pulsed ionospheric heating under auroral electrojet conditions. Journal of Atmospheric and Terrestrial Physics 48, pp. 311 - 326 (1986)
Barr, R.; Rietveld, M. T.; Stubbe, P.; Kopka, H.: The diffraction of VLF radio waves by a patch of ionosphere illuminated by a powerful HF transmitter. Journal Geophysical Research 90, pp. 2861 - 2875 (1985)
Djuth, F. T.; Rost, R. J.; Noble, S. T.; Gordon, W. E.; Stubbe, P.; Kopka, H.; Nielsen, E.; Bostrom, R.; Derblom, H.; Hedberg, A.et al.; Thide, B.: Observations of E-region irregularities generated at auroral latitudes by a higher-power radio wave. Journal Geophysical Research 90, p. 12293 (1985)
Holt, O.; Brekke, A.; Hansen, T.; Kopka, H.; Stubbe, P.: HF modification of the auroral D-region detected by a partial reflection experiment. Journal of Atmospheric and Terrestrial Physics 47, pp. 537 - 545 (1985)
Holt, O.; Brekke, A.; Hansen, T.; Kopka, H.; Stubbe, P.: HF modification of the auroral d-region detected by a partial reflection experiment. Journal of Atmospheric and Terrestrial Physics 47, pp. 537 - 545 (1985)
Barr, R.; Rietveld, M. T.; Kopka, H.; Stubbe, P.: Effect of a heated patch of auroral ionosphere on VLF-radio wave propagation. Nature 309, pp. 534 - 536 (1984)
Frey, A.; Stubbe, P.; Kopka, H.: First experimental evidence of HF produced electron density irregularities in the polar ionosphere, diagnosed by UHF radio star scintillations. Geophysical Research Letters 11, pp. 523 - 526 (1984)
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