Publications of H. Kopka

Hedberg, Å.; Thidé, B.; Boström, R.; Derblom, H.; Kopka, H.; Stubbe, P.: First observations of 140 MHz plasmaline backscatter during heating experiments at Tromsø. Journal Geophysical Research 89, pp. 11038 - 11042 (1984)

James, H. G.; Dowden, R. L.; Rietveld, M. T.; Stubbe, P.; Kopka, H.: Simultaneous observations of ELF waves from an artificially modulated electrojet in space and on the ground. Journal Geophysical Research 89, pp. 1655 - 1666 (1984)

Jones, T. B.; Robinson, T.; Stubbe, P.; Kopka, H.: Frequency dependence of anomalous absorbation caused by high power radio waves. Journal of Atmospheric and Terrestrial Physics 46, pp. 147 - 153 (1984)

Rietveld, M. T.; Barr, R.; Kopka, H.; Nielsen, E.; Stubbe, P.; Dowden, R. L.: Ionospheric heater beam scanning: A new technique for ELF studies of the auroral ionosphere. Radio Science 19, p. 1069 (1984)

Rose, G.; Grandal, B.; Neske, E.; Ott, W.; Spenner, K.; Holtet, J.; Måseide, K.; Trøim, J.; Kopka, H.; Stubbe, P.: Raketenmessungen von Modifikationen des Ionosphärenplasmas der F-Schicht, erzeugt von der HEATING-Anlage in Nordnorwegen. KLeinheubacher Berichte (Kleinheubach, 3.-7.10.1983) 27 (1984)

Stubbe, P.; Kopka, H.; Thidé, B.; Hedberg, Å.: Stimulated electromagnetic emission: A new technique to study the parametric decay instability in the ionosphere. Journal Geophysical Research 89, pp. 7523 - 7536 (1984)

Czechowsky, P.; Schmidt, G.; Kopka, H.: Medium Frequency Radar Observations in the Middle Atmosphere. Journal of Atmospheric and Terrestrial Physics 45, pp. 729 - 732 (1983)

Hagfors, T.; Kofman, W.; Kopka, H.; Stubbe, P.; Äijanen, T.: Observations of enhanced plasma lines by EISCAT during heating experiments. Radio Science 18, pp. 861 - 866 (1983)

Hedberg, Å.; Derblom, H.; Thidé, D.; Kopka, H.; Stubbe, P.: Observations of HF backscatter associated with the heating experiment at Tromsø. Radio Science 18, pp. 840 - 850 (1983)

Hibberd, F. H.; Nielsen, E.; Stubbe, P.; Kopka, H.: Production of auroral zone E-region irregularities by ionospheric heating. Journal Geophysical Research 88, p. 6347 (1983)

Jones, T. B.; Robinson, T.; Stubbe, P.; Kopka, H.: A hysteresis effect in the generation of fieldaligned irregularities by a high-power radio wave. Radio Science 18, pp. 835 - 839 (1983)

Rietveld, M. T.; Barr, R.; Dowden, R. L.; Kopka, H.; Nielsen, E.; Stubbe, P.: Ionospheric elctric field pulsation: A comparison between VLF results from an ionospheric heating experiment and STARE. Journal Geophysical Research 88, p. 2140 (1983)

Rietveld, M. T.; Kopka, H.; Nielsen, E.; Stubbe, P.; Dowden, R. L.: Ionospheric elctric field pulsation: A comparison between ULF results from an ionospheric heating experiment and STARE. Radio Science 88, p. 2140 (1983)

Stubbe, P.; Kopka, H.: Summary of results obtained with the Tromsø heating facility. Radio Science 18, pp. 831 - 834 (1983)

Thide, B.; Derblom, H.; Hedberg, A.; Kopka, H.; Stubbe, P.: Observations of stimulated electromagnetic emissions in ionooospheric heating experiments. Radio Science 18, pp. 851 - 860 (1983)

Hedberg, Å.; Derblom, H.; Thidé, B.; Kopka, H.; Stubbe, P.: Observation of HF backscatter associated with the heating experiment at Tromsø. UIO-Report SR-82-02, p. 66 (1982)

Jones, T. B.; Robinson, T.; Kopka, H.; Stubbe, P.: Phase changes induced in a diagnostic radio wave passing through a heated region of the auroral ionosphere. Journal Geophysical Research 87, pp. 1557 - 1564 (1982)

Kopka, H.; Stubbe, P.; Jones, T. B.; Robinson, T.: Nonlinear reflectivity of high-power radio waves in the inosphere. Nature 295, p. 680 (1982)

Stubbe, P.; Kopka, H.; Jones, T. B.; Robinson, T.: Wide band attention of radio waves caused by powerful HF waves: Saturation and dependence on ionospheric variability. Journal Geophysical Research 87, pp. 1551 - 1555 (1982)

Stubbe, P.; Kopka, H.; Lauche, H.; Rietveld, M. T.; Brekke, A.; Holt, O.; Jones, T. B.; Robinson, T.; Hedberg, A.; Thidé, B. et al.; Crochet, M.; Lotz, H.-J.: Ionospheric modification experiments in northern Scandinavia. Journal of Atmospheric and Terrestrial Physics 44, pp. 1025 - 1041 (1982)