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)
Barr, R.; Stubbe, P.: The ``polar electrojet antenna'' as a source of ELF radiation in the earth-ionosphere waveguide. Journal of Atmospheric and Terrestrial Physics 46, pp. 315 - 320 (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)
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)
The European Space Agency (ESA) has given the green light to build the flight models of the spacecraft and science payload for the PLATO mission to search for extrasolar planets.
In the "Solar and Stellar Interiors" department, Laurent Gizon, Jesper Schou, Aaron Birch, Robert Cameron and others offer PhD projects in solar physics and astrophysics. Helioseismology and asteroseismology are used as important tools to study the oscillating Sun and stars.
The longest-serving solar observatory in space has turned 25 and is still making significant contributions to solar research. Its old age has become an important merit.