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Haldoupis, C.; Nielsen, E.: 140 MHz auroral backscatter: evidence for characteristic phase acoustic speed. Geophysical Research Letters 16, S. 723 (1989)

Haldoupis, C.; Nielsen, E.: Very large phase velocities of non two-stream, meter scale irregularities in the high latitude E region ionosphere. Journal Geophysical Research 94, S. 13489 (1989)

Kustov, A.; Uspensky, M.; Kangas, J.; Huuskonen, A.; Nielsen, E.: On the threshold electric field for a 1-m auroral irregularity kapearance. Journal Geophysical Research 94, S. 12043 (1989)

Opgenoorth, H. J.; Bromage, B.; Fontaine, D.; La Hoz, C.; Huuskonen, A.; Kohl, H.; Lovhaug, U.-P.; Wannberg, G.; Gustafsson, G.; Murphre, J. S. et al.; Eliasson, L.; Marklund, G.; Potemra, T. A.; Kirkowood, S.; Nielsen, E.; Wahlund, J. E.: Coordinated observations with EISCAT and the Viking satellite: The decay of a westward travelling surge. Annales Geophysicae 7, S. 479 - 500 (1989)

Rosenbauer, H.; Shutte, N.; Apathy, I.; Galeev, A.; Gringauz, K.; Grünwaldt, H.; Hemmerich, P.; Jockers, K.; Kiraly, P.; Kotova, G. et al.; Livi, S.; Marsch, E.; Richter, A.; Riedler, E.; Remizov, T.; Schwenn, R.; Schwingenschuh, K.; Steller, M.; Szegö, K.; Verigin, M.; Witte, M.: Ions of Martian origin and plasma sheet in the Martian magnetosphere: Initial results of the TAUS experiment. Nature 341, S. 612 - 614 (1989)

Uspensky, M. V.; Kustov, A. V.; Williams, P. J. S.; Huuskonen, A.; Kangas, J.; Nielsen, E.: Effects of unresolved electrojet microstructure on measurements of irregularity drift velocity in auroral radar backscatter. Advances in Space Research 9, S. 5119 (1989)

Curdt, W.; Wilhelm, K.; Craubner, A.; Krahn, E.; Keller, H.-U.: Position of comet P/Halley at the Giotto encounter. Astronomy and Astrophysics 191, S. 1 - 3 (1988)

Keller, H. U.; Kramm, R.; Thomas, N.: Surface features on the nucleus of comet Halley. Nature 331 (6153), S. 227 - 231 (1988)

McDiarmid, D. R.; Nielsen, E.: A monochromatic Pc5 pulsation which exhibits a time-varying doppler-shifted frequency. Journal Geophysical Research 93, S. 1981 (1988)

Mizuno, H.; Markiewicz, W. J.; Völk, H. J.: Grain growth in turbulent protoplanetary accretion disks. Astronomy and Astrophysics 195, S. 183 - 192 (1988)

Nielsen, E.: Aspect angle dependence of backscatter intensity of 1-m auroral plasma waves. Journal Geophysical Research 93, S. 4119 (1988)

Nielsen, E.; Bamber, J.; Chen, Z.-S.; Brekke, A.; Egeland, A.; Murphree, J. S.; Venkatesan, D.; Axford, W. I.: Substorm expansion into the polar cap. Annales Geophysicae 6, S. 559 - 572 (1988)

Nielsen, E.; Senior, C.; Lühr, H.: Ionospheric hall conductivity deduced from ground-based measurements. Journal Geophysical Research 93, S. 4125 (1988)

Nielsen, E.; Uspensky, M.; Kustov, A.; Huuskonen, A.; Kangas, J.: On the dependence of the Farly-BUneman turbulence level on ionospheric electric field. Journal of Atmospheric and Terrestrial Physics 50, S. 601 (1988)

Woch, J.; Kremser, G.; Korth, A.; Pokhotelov, O. A.; Pilipenko, V. A.; Nezlina, Y. M.; Amata, E.: Curvature driven drift mirror instability in the magnetosphere. Planetary and Space Science 36, S. 363 (1988)

Haldoupis, C.; Nielsen, E.: Doppler spectrum observations of long discrete echoes. Planetary and Space Science 35, S. 153 (1987)

Keller, H. U.; Delamere, W. A.; Huebner, W. F.; Reitsema, H. J.; Schmidt, H. U.; Whipple, F. L.; Wilhelm, K.; Curdt, W.; Kramm, R.; Thomas, N. et al.; Arpigny, C.; Barbieri, C.; Bonnet, R. M.; Cazes, S.; Coradini, M.; Cosmovici, C. B.; Hughes, D. W.; Jamar, C.; Malaise, D.; Schmidt, K.; Schmidt, W. K. H.; Seige, P.: Comet P/Halley's nucleus and its activity. Astronomy and Astrophysics 187, S. 807 - 823 (1987)

Keller, H. U.; Kramm, J. R.; Thomas, N.; Craubner, H.; Mikusch, E.; Schwarz, G.: Images of the GIOTTO fly-by of comet Halley. Bulletin of the American Society 19, S. 878 ff. (1987)