Kohl, H.; Kopka, H.; Stubbe, P.; Rietveld, M. T.: Introduction to ionospheric heating experiments at Tromsø - II. Scientific problems. Journal of Atmospheric and Terrestrial Physics 55, pp. 601 - 613 (1993)
Rietveld, M. T.; Kohl, H.; Kopka, H.; Stubbe, P.: Introduction to ionospheric heating at Tromsø - I. Experimental overview. Journal of Atmospheric and Terrestrial Physics 55, pp. 577 - 599 (1993)
Collis, P. N.; Rietveld, M. T.; Röttger, J.; Hocking, W. K.: Turbulence scattering layers in the middle-mesosphere observed by the EISCAT 244-MHz radar. Radio Science 27, pp. 97 - 107 (1992)
Rietveld, M. T.; Collis, P. N.; Röttger, J.: Observations of atmospheric dynamics in the low- and middle mesosphere with the EISCAT incoherent scatter radar during solar proton events. Advances in Space Research 12, pp. (10)81 - (10)84 (1992)
Stubbe, P.; Kohl, H.; Rietveld, M. T.: Reply (to 'Comment on ``Langmuir Turbulence and Ionospheric Modification'' by P. Stubbe, H. Kohl and M. T. Rietveld' by D. F. DuBois, A. Hanssen and H. A. Rose). Journal Geophysical Research 97, pp. 15067 - 15071 (1992)
Dowden, R. L.; Adams, C. D. D.; Rietveld, M. T.; Stubbe, P.; Kopka, H.: Phase and amplitude perturbations on subionospheric signals produced by a moving patch of artificially heated ionosphere. Journal Geophysical Research 96, pp. 239 - 248 (1991)
Maul, A.-A.; Rietveld, M. T.; Stubbe, P.; Kopka, H.: Anregung periodischer Magnetfeldschwankungen durch Einstrahlung von amplitudenmodulierten Hochfrequenzwellen in die polare Ionosphäre. Kleinheubacher Berichte 33, pp. 141 - 149 (1990)
Maul, A.-A.; Rietveld, M. T.; Stubbe, P.; Kopka, H.: Excitation of periodic magnetic field oscillations in the ULF range by amplitude modulated HF waves. Annales Geophysicae 8, pp. 765 - 780 (1990)
Röttger, J.; Rietveld, M. T.; La Hoz, C.; Hall, T.; Kelley, M. C.; Swartz, W. E.: Polar mesosphere summer echoes observed with the EISCAT 933-MHz radar and the CUPRI 46.9-MHz radar, their similarity to 224-MHz radar echoes and their relation to turbulence and electron density profiles. Radio Science 25, pp. 671 - 687 (1990)
Derblom, H.; Thidé, B.; Leyser, T. B.; Nordling, J. A.; Hedberg, Å.; Stubbe, P.; Kopka, H.; Rietveld, M. T.: Tromsø heating experiments: Stimulated emission at HF pump harmonic and subharmonic frequencies. Journal Geophysical Research 94, pp. 10111 - 10120 (1989)
La Hoz, C.; Röttger, J.; Rietveld, M.; Wannberg, G.; Franke, S. J.: The status and planned developments of EISCAT in mesosphere D-region experiments. Handbook for MAP 28, pp. 476 - 488 (1989)
Rietveld, M. T.; Stubbe, P.; Kopka, H.: On the frequency dependence of ELF/VLF waves produced by modulated ionospheric heating. Radio Science 24, pp. 270 - 278 (1989)
Röttger, J.; Rietveld, M. T.; La Hoz, C.; Hall, T.; Kelley, M. C.; Swartz, W. E.: Polar mesosphere summer echoes observed with the EISCAT 933-MHz radar and the CUPRI 46.9-MHz radar. Handbook for MAP 28, pp. 168 - 178 (1989)
Barr, R.; Rietveld, M. T.; Stubbe, P.; Kopka, H.: Ionospheric heater beam scanning: A realistic model of this mobile source of ELF/VLF radiation. Radio Science 23, pp. 379 - 388 (1988)
Barr, R.; Rietveld, M. T.; Stubbe, P.; Kopka, H.: Ionospheric heater beam scanning: A mobile source of ELF radiation. Radio Science 22, pp. 1073 - 1083 (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)
Rietveld, M. T.; Stubbe, P.: Ionospheric demodulation of powerful pulsed radio waves: A potential new diagnostics for radars suggested by Tromsø heater results. Radio Science 22, pp. 1084 - 1090 (1987)
Application deadline 1 October 2024. PhD projects in planetary science, solar and stellar physics, solar magnetism, heliophysics, helioseismology, asteroseismology, ...
First Light for Sunrise III: the first tests with real sunlight were successful. The balloon-borne solar observatory should be ready for launch at the end of May.
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)