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Özgüç, A., “On the Longitudinal Distribution of the Solar Surges”, Solar Physics, 123, 2, 381-383, 1989. Dil Türkçe
Altaş, L., “Major Flare Effects on the Intensity of the Green Corona and Geomagnetic Activity”, Earth Moon and Planets, 46, 2, 127-134, 1989. Dil Türkçe
Sarıbudak, M., Sanver, M., Ponat, E., “Location of the Western Pontides, NW Turkey, During Triassic Time Preliminary Paleomagnetic Results”, Geophysical Journal-Oxford, 96, 1, 43-50, 1989. Dil Türkçe
Özgüç, A., Düzgelen, A., “Distribution of lde Flares on the Sun During Solar Cycle-20 and Cycle-21”, Astrophysics and Space Science, 162, 1, 27-33, 1989. Dil Türkçe
Özgüç, A., “78 Day Periodicity in the Solar 1-8-A X-Ray Index During the Ascending Branch of Cycle 21”, Astrophysics and Space Science, 162, 1, 123-127, 1989. Dil Türkçe
Dizer, M., Özgüç, A., “Spectral Studies of the Time Series of the Geomagnetic Activities”, Earth Moon and Planets, 43, 3, 211-220, 1988. Dil Türkçe
Özgüç, A., Düzgelen, A., “Kinematics of a Twisted Surge”, Astrophysics and Space Science, 150, 2, 383-386, 1988. Dil Türkçe
Koçer, D., Bolçal, Ç., Sağlamsaatçi, M., Düzgelen, A., “A Spectroscopic Analysis of the am star hd-73730”, Astrophysics and Space Science, 149, 2, 273-286, 1988. Dil Türkçe
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