Stubbe, P.; Kopka, H.; Rietveld, M. T.; Dowden, R. L.: ELF and VLF wave generation by modulated HF heating of the current carrying lower ionosphere. Journal of Atmospheric and Terrestrial Physics 44, pp. 1123 - 1135 (1982)
Thidé, B.; Kopka, H.; Stubbe, P.: Oberservations of stimulated scattering of a strong high-frequency radio wave in the ionosphere. Physical Review Letters 49, pp. 1561 - 1564 (1982)
Dowden, R. L.; Stubbe, P.; Kopka, H.: VLF wave generation by modulated RF heating of the electrojet ionosphere. Advances in Space Research 1, pp. 221 - 223 (1981)
Fejer, J. A.; Kopka, H.: The effect of plasma instabilities on the ionosherically reflected wave from a high-power transmitter. Journal Geophysical Research 86, pp. 5746 - 5750 (1981)
Stubbe, P.; Kopka, H.: Generation of Pc5 pulsations by polar electrojet modulation: First experimental evidence. Journal Geophysical Research 86, pp. 1606 - 1608 (1981)
Stubbe, P.; Kopka, H.; Dowden, R. L.: Generation of ELF and VLF waves by polar electrojet modulation: Experimental results. Journal Geophysical Research 86, pp. 9073 - 9078 (1981)
Kopka, H.; Daly, P. W.: A Guide to LaTeX 2e: Document Preparation for Beginners and Advanced Users, (2nd edition). Addison-Wesley, Wokingham (1995), 553 pp.
Lefeuvre, F.; Rauch, J. L.; Dee, V. I.; Titova, E. E.; Yurov, Y. E.; Molchanov, O. A.; Mogilevsky, M. M.; Maltseva, O. A.; Zinin, L. V.; Kopka, H.et al.; Rietveld, M. T.; Stubbe, P.; Dowden, R. L.: Detection from Aureol-3 of the modulation of auroral electrojet by HF heating from ELF signals in the upper ionosphere above Tromsø. In: Results of the Arcad-3 project and of the recent programmes in magnetospheric and ionospheric physics, pp. 609 - 619. Cepadues-Editions, Toulouse, France (1985)
Stubbe, P.; Kopka, H.: Modification of the F region by powerful radio waves. In: Exploration of the Polar Upper Atmosphere, pp. 83 - 98 (Eds. Deehr, C. S.; Holtet, J. A.). D. Reidel Publishing Company, Dordrecht (1980)
Kopka, H.; Pruchniewicz, G.; Schlegel, K.; Stubbe, P.: Zukunftsaspekte in der Aeronomie. In: Institut für Ionosphärenphysik im Max-Planck-Institut für Aeronomie 1946-1971, Festschrift zum 25jährigen Bestehen des Instituts für Ionosphärenphysik in Lindau am Harz, pp. 225 - 228 (Ed. Dieminger, W.). Hubert & Co., Göttingen (1972)
Rietveld, M. T.; Barr, R.; Stubbe, P.; Maul, A.; Kopka, H.; Dowden, R. L.: VLF, ELF and ULF research using the Tromsø heating facility. In: AGARD Conference Proceedings No. 485, Bergen, 28.-31. Mai 1990, 6-1 bis 6-10. (1990)
Grandal, B.; Rose, G.; Holtat, J.; Måseide, K.; Neske, E.; Ott, W.; Spenner, K.; Trøim, J.; Kopka, H.; Stubbe, P.: Preliminary results from the HERO project: In situ measurements of ionospheric modifications using sounding rockets. In: ESA Conference Proceedings SP-195 on ``Active Experiments in Space'' (Alpbach, Austria, 24-28 May 1983), pp. 75 - 80. (1983)
Jones, T. B.; Robinson, T.; Stubbe, P.; Kopka, H.: Anomalous absorption effects produced by high power radio waves in the high latitude ionosphere. In: AGARD Conference Proceedings on Propagation Aspects of Frequency Sharing, Interference and System Diversity, p. 5-1}-{5-9. (1983)
Kohl, H.; La Hoz, C.; Folkestad, K.; Hansen, T.; Kopka, H.; Rose, G.; Stubbe, P.: The electron and ion spectra of radar returns from the critical height during ionospheric heating experiments. In: ESA Conference Proceedings SP-195 on ``Active Experiments in Space'' (Alpbach, Austria, 24-28 May 1983), pp. 91 - 97. (1983)
Rose, G.; Grandal, B.; Neske, E.; w., O.; Spenner, K.; Trøim, J.; Holtet, J.; Måseide, K.; Kopka, H.; Stubbe, P.: First results of the in situ measurements of the HERO heating campaign. In: ESA Conference Proceedings SP-183 on ``European Rocket and Balloon Programmes'' (Interlaken, Switzerland, 14-15 April 1983), pp. 263 - 267. (1983)
Stubbe, P.; Kopka, H.: Summary of ionospheric heating experiments at Tromsø. In: ESA Conference Proceedings SP-195 on ``Active Experiments in Space'' (Alpbach, Austria, 24-28 May 1983), pp. 47 - 50. (1983)
Stubbe, P.; Kopka, H.; Rietveld, M. T.; Dowden, R. L.: Generation of ELF and VLF waves by modulated HF heating of the polar electrojet. In: AGARD Conference Proceedings on Medium, Long and Very Long Wave Propagation, p. 9-1 - 9-6. (1982)
Stubbe, P.; Kopka, H.; Brekke, A.; Hansen, T.; Holt, O.; Dowden, R. L.; Jones, T. B.; Robinson, T.; Lotz, H.-J.; Watermann, J.: First results from the Tromsø ionospheric modification facility. In: AGARD Conference Proceedings on the Physical Basis of the Ionosphere in the Solar-Terrestrial System, p. 16-1-16-9. (1980)
Stubbe, P.; Kopka, H.; Rose, G.: Rocket experiments in conjunction with the ionospheric modification experiment in northern Norway. In: Proc. Esrange Symp., Ajaccio, Korsika 24.-29.4., pp. 107 - 111. ESA Publ. Div., Noordwijk (1978)
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)