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)
Application deadline 1 October 2024. PhD projects in planetary science, solar and stellar physics, solar magnetism, heliophysics, helioseismology, asteroseismology, ...
In analyzing solar observations from the 19th century, scientists are turning to amateur researchers for help. The project will allow to better understand the history of our star.
Astronomical teamwork: By combining data from Solar Orbiter and SDO, a group of researchers has unambiguously determined the magnetic field at the solar surface.
Application deadline 1 October 2023. PhD projects in planetary science, solar and stellar physics, solar magnetism, heliophysics, helioseismology, asteroseismology, ...
Philipp Löschl has co-authored an excellent publication on Solar Orbiter data which has been awarded best Solar Physics paper of 2022 (Gherardo Valori et al. 2022)