Güneş Fiziği Yayınları

• Dizer, M., 1948 yılı Güneş leke rasatları, Observations des taches solaires en 1948, İst. Kandilli Rasathanesi Yayınları, sayı 3, 1949
• Sipahioğlu, O.N.-Dizer, M.,20 Şubat 1950’deki büyük magnetik fırtına ve fecr-i şimali, La grande perturbation magnetique et l’aurore boreale du 20 fevrier 1950, İst. Kandilli Rasathanesi Yayınları, sayı 4, 1950

• Dizer, M., 1949 yılı Güneş leke rasatları, Observations des taches solaires en 1949, İst. Kandilli Rasathanesi Yayınları, sayı 5, 1950
• Dizer, M., Arzın Güneş leke  faaliyeti üzerine görülen bit tesiri hakkında., On Apparent Earth-Effect on Sunspot Activity, İst. Univ. Fen Fak. Mecmuası, Seri A, Cilt XV, Sayı 3, 205-211, İst. Üniv. Obs. Yazıları, Sayı 38, 1950
• Dizer, M., 1950 yılı Güneş leke rasatları, Observations des taches solaires en 1950, İst. Kandilli Rasathanesi Yayınları, sayı 6, 1951
• Dizer, M., 1951(Ocak-Haziran) yılı Güneş leke rasatları, Observations des taches solaires en 1951(Janvier-Juin), İst. Kandilli Rasathanesi Yayınları, sayı 7, 1951
• Dizer, M., Güneş leke gruplarının bazı özellikleri, Quelques proprietes des groupes de taches solaires., İst. Univ. Fen Fak. Mecmuası, Seri A, Cilt XVII, 387-393., İst. Üniv. Obs. Yazıları, Sayı 46, 1952
• Dizer, M., Kandilli Rasathanesinde 1949 Ocak ayından 1951 Haziran ayına kadar yapılan Güneş leke rasatları, İst. Kandilli Rasathanesi Yayınları, sayı 9, 1953
• Dizer, M., Protuberans Rasatları (17 Ekim 1950 den 30 Haziran 1951’e kadar)., İst. Kandilli Rasathanesi Yayınları, sayı 10, 1953
• Dizer, M., Protuberans Rasatları (Kasım 1952  -Aralık 1953)., İst. Kandilli Rasathanesi Yayınları, sayı 11, 1954
• Dizer, M., 1953  Güneş leke rasatları, Observations des taches solaires en 1953, İst. Kandilli Rasathanesi Yayınları, sayı 13, 1954
• Dizer, M., Kandilli Rasathanesinde yapılan protüberans rasatları, Les Observations des protuberances faites a l’Observatoire de Kandilli(İstanbul)., İst. Univ. Fen Fak. Mecmuası, Seri C, Cilt XIX, 76-89., İst. Üniv. Obs. Yazıları, Sayı 49,
• Dizer, M., Kandilli Rasathanesinde yapılan protüberans rasatları (Kasım 1952-Aralık 1953), Observations des protuberances faites a l’Observatoire de Kandilli de November 1952 a Decembre 1953, İst. Univ. Fen Fak. Mecmuası, Seri C, Cilt XIX, 278-286, İst. Üniv. Obs. Yazıları, Sayı 52, 1954
• Dizer, M., Kandilli Rasathanesinde yapılan protüberans rasatları, Les Observations des protuberances faites a l’Observatoire de Kandilli İstanbul en 1954, İst. Univ. Fen Fak. Mecmuası, Seri C, Cilt XX, İst. Üniv. Obs. Yazıları, Sayı 54,1955
• Dizer, M., Sur le cycle de 80 ans de l’activite solarie, Ann. D’Astrophysique,, Vol. 19,207,1956
• Dizer, M., Sur la relation entre les disparitions brusques de filaments et les orages magnetiques, Anneles des Geophysique, Tome 13, No. 4, 235, 1957
• Dizer, M.,1957 senesinde  Kandilli Rasathanesinde yapılan protüberans rasatları, Observations des protuberances faites a l’Observatoire de Kandilli İstanbul en 1957, İst. Univ. Fen Fak. Mecmuası, Seri C, Cilt XXII,50-67, İst. Üniv. Obs. Yazıları, Sayı 63,1958
• Dizer, M., 1954  Güneş leke rasatları, Observations des taches solaires en 1954, İst. Kandilli Rasathanesi Yayınları, sayı 20, 1959.
• Dizer, M.,1958 senesinde  Kandilli Rasathanesinde yapılan protüberans rasatları, Observations des protuberances faites a l’Observatoire de Kandilli İstanbul en 1958, İst. Kandilli Rasathanesi Yayınları, sayı: 21, 1959
• Dizer, M., Note Sur les Foyers de l’Activite Solair, Bull. Turkish Phys.Soc.No.36,1959.
• Dizer, M., Long-lived filament and geomagnetic storm., The Observatory, 82, 250-253, 1962
• Dizer, M., Sudden disappearance of filaments and geomagnetic activity, Ann. De Geophysique, 18, 388-389,1962
• Dizer, M., Influence of sunspot activity on the geomagnetic activity in the northern and southern solar hemispheres. Ann. De Geophysique, 19, No.1,1963
• Dizer, M., The Sun and Artificial Satelite, Sky and Telescope, 33,123,1967
• Dizer, M., Flare Isophote, Solar Physics, 2,1, 1967
• Soytürk, E., Isophote of the Artificial Satellite for Experimental Verification of Astronomical Seeing, Planet. Space Sci.15, 1799-1800, 1967
• Dizer, M., A Typical Twisted Surge on November 10, 1967, Solar Physics 4, 99-100,1968
• Dizer, M., Filamentler ve geomagnetik fırtınalar arasındaki bağıntı, İst. Kandilli Rasathanesi Yayınları, Sayı:33, 1968
• Dizer, M., Manyetik faaliyetin 27 günlük peryodu hakkında, İst. Kandilli Rasathanesi Yayınları, Sayı:34, 1968
• Dizer, M., Isophotol photometry and morphological changes in the flare, Solar Physics 10, 416-428,1969
• Özgüç, A., Kandilli Rasathanesinde Solar Seeing, İst. Kandilli Rasathanesi Yayınları, sayı: 38, 1971
• Dizer,M., ve Yazıcı, M.N., Isophotometric Measurements of Mercury, Astrophysics and Space Science 13 (1971) 106-109
• Özgüç, A., Yazicı, M.N., Statistical Sunspot Results in Kandilli Observatory from 1955 to 1968, İst. Kandilli Rasathanesi Yayınları, sayı: 39, 1971
• Dizer, M., Güneş Erüpsiyonlarının Mikrofotometrik ve Morfolojik İncelenmesi, Kandilli Rasathanesi Güneş Fiziği Yayınları, 1973
• Dizer, M.,Soytürk, E., 19 Haziran 1936 Tam Güneş Tutulması, Kandilli Rasathanesi Güneş Fiziği Yayınları, 1973
• Dizer, M.,Observations of the Chromosheric Flares at Kandilli Observatory during the year 1965, Pub. Kandilli Observatory, 1973
• Özgüç. A. Solar Activity in the years 1969-1973, Kandilli Obs. Pub.Second Ser.1, 1976.
• Dizer, M., A Loop Prominance System Observed on May 24, 1972, Solar Physics 59, 357-360, 1978
• Soytürk, E., Özgüç, A., Observations of Solar Flares at Kandilli Observatory during the year 1966, Kandilli Obs. Pub.Second Ser.2, 1979
• Tekman, T., Altaş, L., Solar Activitiy in the Years 1974-1977, Kandilli Obs. Heliophys. Pub. Second Seri Nr. 4, 1982.
• Ataç, T., Vatandaşlar, S., Solar Activity in the years 1978-1979, Kandilli Obs. Heliophys. Pub. Second Seri Nr. 5, 1982
• Soytürk, E., Özgüç, A., Evolution of Overall Photographic and Isodansitometric Investigation of McMath Plage Region 14943 in H-alpha and Ca-K lines, September 7-24, 1977 and Associated Geomagnetic and SEA events., World Data Center A for Solar- Terrestrial Physics, U.S.A. Report UAG-83, Part I, 15-21, 1982.
• Soytürk, E., Özgüç, A., Morphological Structure and Energy Content of Flares of September 19, 1977 in in H-alpha and Ca-K lines and Associated Geomagnetic and SEA events., World Data Center A for Solar- Terrestrial Physics, U.S.A. Report UAG-83, Part I, 33-37, 1982.
• Soytürk, E., Özgüç, A., Morphological Structure and Energy Content of Flares of November 22, 1977 in H-alpha and  Ca-K lines and Associated Geomagnetic and SEA Events, World Data Center A for Solar-Terrestrial Physics, USA,   Report UAG-83, Part II, 478-483, 1982.
• Özgüç, A.,Solar Activity in the Year 1982., B.U.Kandilli Obs. Pub. Second Ser. No. 11, 1983
• Özgüç, A., Ani Kaybolan Bir Filamentin İncelenmesi
• Dizer ve Özgüç (Editors), Proceedings of National Astronomy Meeting 1984, 25-33, Publication of Boğaziçi University, 1985
• Özgüç, A., Düzgelen, A., Kinematics of a twisted surge, Astrophysics and Space Science (ISSN 0004-640X), vol. 150, no. 2, Dec. 1988, p. 383-386., 12/1988
• Özgüç, A., Sağlamsaatçi, M., Solar rotation rate from stable sunspot tracings, Astrophysics and Space Science (ISSN 0004-640X), vol. 153, no. 2, March 1989, p. 345-349.,03/1989
• Atac, T., On the SID durations, Astrophysics and Space Science, vol. 181, no. 1, July 1991, p. 157-159. 07/1991
• A.Rokicki, I.Stanislawska, Z.Zhyszynski, Y.Tulunay, A.Özgüç, T.Ataç, L.Altaş ve O.Barlas, First Results from the Transportable Ionosonde Campaign, Prime Studies with Emphasis on TEC and Topside Modelling, Proceeding of Prime Cost Workshop, Austria, PartII, p. 297, 1993. Karl-Franzens, Universitat Graz.
• Özgüç, A.,Yeşilyaprak, H., Tulunay, Y., The signature of the IMF reversals on the Kandilli magnetic Field data between 1963 and 1986 (Abstract), STEP Symposium/5th COSPAR Colloquium Abstracts pp 55, 1992
• Erol, C.B., Tulunay,Y., Gibson, A.J., Yılmaz, U.M., Özgüç, A., Ataç, T., Characteristics of Fading of HF Signal and Noise Intensities on Several Paths Between the UK and Kandilli and Göztepe, Turkey, Tr. J. of Physics, 1994, 18, 1155.
• Gibson, A.J., Yılmaz, U.M., Tulunay, Y., Erol, C.B., Özgüç A., Ataç, T., Characteristics of Fading of HF Signal and Noise Intensities on Three Paths Between the UK and Turkey, 7th International Ionospheric Effects Symposium, 1993. Radio Science, 1995, 30, 69.
• Stanislawska, I., Tulunay, Y., Özgüç A. Local Model of the Ionosphere Above Istanbul, Proceedings of the Cost 238/PRIME Workshop,Eindhoven, p. 317, 1994
• Ataç, T., Tulunay, Y., Özgüç, A., Stanislawska, I.,Altaş, L., Barlas, O., Kritik Frekansın (foF2) Güneş aktivitesine Bağımlılığı, 9. Ulusal Astronomi Toplantısı Tebliğleri,(Poster) pp.161, 1994 O.D.T.Ü.
• Gibson, A.J., Yılmaz, U.M., Tulunay, Y., Erol, C.B., Özgüç A.,Ataç, T., Characteristics of Fading of HF Signal and Noise Intensities on Three Paths Between the UK ,and Turkey, 7th International Ionospheric Effects Symposium, 1993.Radio Science, 1995, 30, 69.
• Altaş, L., Düzgelen, A., 24 Eylül 1991 Surge Olayının Kinematik ve Yapısal Özellikleri, 10. Ulus. Astr. Kong. Bild. İstanbul, s. 502, 1996
• Altaş, L., Düzgelen, A., Prominence Ejection into the Corona of September 24, 1991, Rom. Astron. J. Vol. 6, Supplement, p. 53, Bucharest, 1996
• Altas, L., Duzgelen, A.,The Bright Surge-Like Spike at the Solar Limb September 24, 1991, Solar Physics, v. 171, Issue 1, p. 145-153. 03/1997
• Altas, L.; Duzgelen, A.; Barlas, O. The Determination of the Reduction Factor for Sunspot Observations and its Variation with Meteorological Parameters, Solar Physics, v. 178, Issue 2, p. 267-270.  00/1998
• O.Barlas, A.Düzgelen ve L.Altaş, Kandilli Gözlemevi için Güneş Lekeleri İndirgeme Katsayısının Belirlenmesi ve Meteorolojik Değişkenlerle İlişkileri, 10.Ulus. Astr. Kong. Bild. İstanbul, s. 503, 1996.)
• Sözen E., Özgüç A., Ataç, T., Altaş, L. 11 Ağustos Tam Güneş Tutulması Hazırlık ve Gözlem Çalışmaları, Ege Üniversitesi ,İzmir, 12. Ulus. Astr. Top. Tebl. s. 469-476, Eylül 2000.

Veri katkısında bulunduğumuz merkezlerden alınan verilerle yapılan çalışmalar

• Özgüç, A., Güneşin Kuzey-Güney Yarıkürelerinde Leke aktivitesindeki Asimetri, Kandilli Rasathanesi Güneş Fiziği Servisi Bilimsel Yayınlar, (DOKTORA TEZİ) 1982
• Atac, T. ,Statistical relationship between sunspots and major flares, Astrophysics and Space Science, , vol. 129, no. 1, Jan. 1987, p. 203-208.,01/1987
• Atac, T. ,Time variation of the flare index during the 21st solar cycle, Astrophysics and Space Science, vol. 135, no. 1, July 1987, p. 201-205, 07/1987
• Atac, T , Relation of the fluctuations of some of the solar activity indices, Astrophysics and Space Science, vol. 153, no. 1, March 1989, p. 173-176. ,03/1989
• Altas, L., Major flare effects on the intensity of the green Corona and geomagnetic activity, Earth, Moon, and Planets), vol. 46, Aug. 1989, p. 127-134, 8/1989
• Atac, T., On the short term variations of solar activity during solar cycle 21, Earth, Moon, and Planets, vol. 47, Nov. 1989, p. 165-170. 11/1989
• Özgüç, A., Düzgelen, A., Distribution of LDE flares on the sun during solar cycles 20 and 21, Astrophysics and Space Science , vol. 162, p. 27-33.), 12/1989
• Özgüç, A., Ataç, T., Periodic behavior of solar flare index during solar cycles 20 and 21, Solar Physics , vol. 123, p. 357-365,  1989
• Özgüç,A., Ataç, T.,20. ve 21. Güneş çevrimleri süresince 'Flare Index'in peryodik davranışları, I.Yavuz (Ed.) Procedings of VI. National Astronomy Meeting , 1989, p. 147.
• Dizer, M., Periodicity and distribution of the sudden disappearances of solar prominences in the chromosphere, Astrophysics and Space Science ,vol. 173, no. 1, Nov. 1990, p. 127-144. , 11/1990
• Barlas, O., Altas, L.,The duration of spotless flares, Astrophysics and Space Science, vol. 197, no. 2, p. 337-341.   11/1992
• Özgüç, A., Ataç, T.,152-Day Periodicity During Solar Cycle 22, The Sun as a Variable Star, IAU Colloquium No. 143, Abstracts, p.156, 1993
• Özgüç, A., Ataç, T., The 73-day periodicity of the flare index during the current solar cycle, Solar Physics, vol. 150,  p. 339-346, 03/1994
• Özgüç, A.; Atac, T., The 73-Day Periodicity of the Flare Index during the Current Solar-Cycle-22, Solar Physics, vol. 152, p.318, 1994
• Altas, L., Spotless flare activity, Solar Physics, vol. 151, no. 1, p. 169-176, 04/1994
• Bölge, H., Altas, L.   Low-frequency analysis of the sunspot cycles, Astron. Astrophys. 288, 967-972 (1994), 08/1994
• Bölge, H., Altas, L., Güneş Leke Çevrimlerinin Alçak Frekans Modülasyonu, 9. Ulusal Astronomi Toplantısı Tebliğleri,(Poster) pp.161, 1994 O.D.T.Ü.
• Altaş, L. ve Özgüç, A., Kimi Güneş Parlamalarının Göreceli Dönmeye Göre Dağılımları, ODTÜ, 9. Ulus. Astr. Top. Tebl. s. 75-77, 1994
• Özgüç, A., Tulunay, Y., Ataç, T., Stanislawska, I., Rokicki, A., Altaş, L., Barlas, O.,The Ionospheric foF2 data over Istanbul and their Response to Solar Activity for the years 1963-1969 and 1993.(Abstract), SCOSTEP 8th ISSTP Sendai, Japan Abstracts 1994 p.  162.
• Tulunay, Y.,  Özgüç, A., Ataç, T.,Ionospheric variability over Istanbul. (Abstract), SCOSTEP 8th ISSTP Sendai, Japan, Abstracts 1994 p.  174.
• Vrşnak, B., Ruzdjak, V., Altaş, L., Özgüç, A. Zlobec, P., Soft x-ray Radiation Associated with Flares Developing in Strong Magnetic Fields, Hvar Obs. Bull. 19, 1, 15-22, 1995
• Vrşnak, B., Ruzdjak, V., Altaş, L., Özgüç, A. Zlobec, P., Soft x-ray Radiation Associated with Flares Developing in Strong Magnetic Fields, JOSO Annual Report '95' Ed. M. Saniga, Astron. Ins. Tatranska Lomnica 1995,165. (Poster)
• Özgüç, A., Atac, T., Confirmation of the 25.5-Day Fundamental Period of the Sun Using the North-South Asymmetry of the Flare Index, Solar Physics, v. 163, p. 183-191,01/1996
• Özgüç, A., Altaş, L., Longitudinal Distribution of Flares in the Late Phase of Active Regions, Solar Physics, v. 163, p. 327-333., 02/1996
• Ataç, T., Özgüç,A., North-South Asymmetry in the Solar Flare Index, Solar Physics, v. 166, p.201, 06/1996
• Tulunay, Y., Baykal, Ş.A., Yiğit,Y.G., Stanislawska, I., Rokicki, A., Zbyszynski, Z., Özgüç, A., Ataç, T., Altaş, L., Barlas, O., Spectral analysis of the foF2 data obtained at five PRIME sites during a 15 minute campaign in June 1993., Annali di Geofisica 1996, XXXIX, 4, 863 - 875.
• Özgüç, A.,Tulunay, Y., On the possible use of solar flare Index data for ionospheric predictions (Abstract), COSPAR 31. Scientific Assembly, 14-21, July, 1996 ,Abstracts pp. 244, 1996
• Altaş, L., Özgüç, A., Longitudinal Distribution of Lesser Flares on the Sun  (Abstract), COSPAR 31. Scientific Assembly, 14-21, July, 1996 p.290
• Özgüç, A., Ataç, T., Tulunay, Y., Stanislawska, I.,The Ionospheric foF2 data over Istanbul and their response to solar activity for the years, 1964-1969 and 1993., Studia Geoph. Geod. 1998, 42,112-118.
• Özgüç, A., Tulunay, Y., Stanislawska, Ataç, T.,The characteristic behaviour of the foF2 over Istanbul during 1966-1968, 1972 and 1993 (Abstract)., 32^nd Scientific Assembly of COSPAR Abstracts, 12-19 July  1998 Nagoya, Japan, p.181.
• Özgüç, A., Ataç, T.,The hysteresis effect in solar cycle variation among some solar indices (Abstract), 32^nd Scientific Assembly of COSPAR Abstracts, 12-19 July  1998 Nagoya, Japan, p.341.
• Vrsnak B., Ruzdjak V., Brajsa R., Altaş,L., Özgüç A., Aurass H., Zlobec P.,        Propagation of various disturbances in different magnetic field structures inferred from different flare scenarios (Abstract) (Poster), 3rd Advances in Solar Physics Euroconference 22-26 Sep. 1998, Potsdam, Germany, p. 94
• Özgüç, A.; Tulunay, Y.; Ataç, T., Examination of the solar cycle variation of foF2 by using solar flare index for the cycle 21, Advances in Space Research, Volume 22, Issue 1, p. 139-142.,1998
• Atac, T., Özgüç, A., Flare Index of Solar Cycle 22, Solar Physics, v. 180, Issue 1/2, p. 397-407. 06/1998
• Yeşilyaprak, H., Güneş Leke Nestleri ve Özelliklerinin İncelenmesi, Danışman Prof.Dr. Adnan Ökten, yayınlanmamış Yüksek Lisans Tezi 1999
• Vrsnak, B.; Ruzdjak, V.; Brajsa, R.; Zlobec, P.; Altas, L.; Özgüç, A.; Aurass, H., Schroll, A., Characteristics of Flares with Hα Emission Protruding over Major Sunspot Umbrae, Solar Physics, v. 194, Issue 2, p. 285-303 (2000). 06/2000
• Özgüç, A.; Rusin, V.; Rybansk?, M., Livingston, W. , Observations of the Total Solar Eclipse August 11, 1999, Last Total Solar Eclipse of the Millennium, ASP Conference Series, Vol. 205. Edited by W. Livingston and A. Ozque. ISBN: 1-58381-032-3 (2000), p.184,   00/2000
• G. Kandemir, M.C. Güçlü, M. Geçkinli, C. Fırat, Ş. Boydağ, A. Özgüç, T. Yaşar.,Variation of Cosmic Ray Intensity during the  Solar Eclipse August 11, 1999, Proceedings of  The Last Total solar eclipse of the Millennium in Turkey, Eds. Livingston and Özgüç, ASP, Conf. Ser. Vol. 205, 202, 2000.
• Özgüç, A. Ataç,T., Effects of Hysteresis of some Solar Indices (Abstract), JENAM 98 Abstracts, 9-12 Sep., 1998, Prague, Czech Republic,   p. 56
• Özgüç, A., Ataç, T., Antalova, A.,  Effects of hysteresis of some solar indices, Recent Insights into the Physics of the Sun and Heliosphere: Highlights from SOHO and other Space Missions, International Astronomical Union. Symposium no. 203. Manchester, England, August 2000. ,2000
• Özgüç, A., Ataç, T., Antalova, A., Effects of hysteresis of some solar indices during the past three solar cycles 20,21 and 22, Proc. 1st Solar & Space Weather Euroconference,"The Solar Cycle and Terrestrial Climate". Santa Cruz de Tenerife, Tenerife,  (ESA SP-463, 403-405, 2000)
• Özgüç, A., Ataç, T.,   Observations of Hysteresis Between Flare Index and Some Solar Indices, Recent Insights into the Physics of the Sun and Heliosphere:  P. Brekke, B. Fleck, and J. Gurman eds. IAU Sym. Ser. Vol. 203,  125-128, 2001.
• Özgüç, A., Ataç, T., Effects of hysteresis in solar cycle variations between flare index and some solar activity indicators. 2002, Solar-Terrestrial Magnetic Activity and Space Environment H.N. Wang and R. Xu (Eds.), COSPAR Coll. Ser. 14, 447.
• Özgüç, A., Ataç, T., Rybak, J., Long-term periodicities in the Flare Index between the Years 1966-2001, Proc. 10th European Solar Physics Meeting, Prague,9 - 14 September 2002, ESA SP-506, 709, 2002.
• Özgüç, A., Ataç, T., Effects of hysteresis in solar cycle variations between flare index and cosmic rays, Proc. ISCS, ‘Solar Variability as an Input to the Earth’s Environment’,Tatranska Lomnica,Slovakia, 23 – 28 June 2003, ESA SP-535, 687-689, 2003.
• Özgüç, A., Ataç, T.,   Effects of hysteresis in solar cycle variations between flare index and cosmic rays, New Astronomy, 2003, 8, 745 – 750.
• Ataç,T., Özgüç, A., Flare Index During the Rising Phase of Solar Cycle 23, Solar Physics, 2001, 198, 399-407.
• Özgüç, A., Ataç, T., and Rybak, J.,  Flare index variability in the ascending branch of solar cycle 23., J. Geophys. Res. 2002, 107(A7), art. No. 1146
• Ataç, T., Özgüç, A.,   23. Güneş Çevrimi Çıkış Kolunda Güneş Etkinliği İndekslerinin Dönemli Değişimleri, Proceedings of National Astronomy Meeting, XIII,  2002, TÜBİTAK yayınları 75-83, 2003.
• Özgüç, A., Ataç, T., Rybak, J., Temporal variability of the flare index (1966-2001), Solar Physics, 2003, 214, 375-396.
• Özgüç, A., Ataç, T., Rybak, J., Short-term periodicities in the Flare Index between the Years 1966-2001, Proc. ISCS, ‘Solar Variability as an Input to the Earth’s Environment’ Tatranska Lomnica, Slovakia, 23 – 28 June 2003, ESA SP-535, 141-143, 2003.
• Özgüç, A., Ataç, T., Rybak, J., Evidence of the fundamental periodicity in the flare index between the years 1966-2002., Proc. of Multi-Wavelength Investigations of Solar Activity, IAU Symposium, No. 223., Cambridge, UK: Cambridge University Press, 2004., p.557-558
• Özgüç, A., Ataç, T., Rybak, J., Evaluation of the short-term periodicities in the flare index between the years 1966-2002, Solar Physics, 2004,223, 287 – 304.
• Özgüç, A., Ataç, T., Rybak, J.,Evaluation of the short-term periodicities in the Flare Index between the Years 1966-2001., Book of Abstracts “Multi-wavelength Investigations of Solar Activity”, IAU sym. No.223, St. Petersburg, June 14-19, 2004, p.162 (abstract).
• Özgüç, A., Ataç, T.,Temporal variability of the north-south asymmetry in the solar flare index between activity cycles 17-23., “Direct and indirect observations of long-term solar activity”, 1^st Int. Sym. on Space Climate,June 20-23, 2004, Oulu, p. 89 (abstract).
• Rybak, J., Özgüç, A., Ataç, T and Sözen, E., Intermittence of the short-term periodicities of the flare Index, Advances in Space Research  35, 406-409, 2005.
• Ataç, T., Özgüç, A., Rybak, J., Intermediate-term periodicities in some solar activity indices during cycle 23., Proc. 11^th European Solar Physics Meeting, ESA SP-596, 2005.
• Ataç, T., Özgüç, A., Rybak, J., Overview of the flare Index during the maximum phase of the solar cycle 23, Advances in Space Research  35, 400-405, 2005.
• Ataç, T., Özgüç, A., Rybak, J., Periodicities in irradiance and in other solar activity indices during Cycle 23, Solar Physics, 237, 433 – 444, 2006.
• Ataç,T., Özgüç, A., Rybak, J., Yeşilyaprak, H., Pektaş. R., 23. Güneş Çevriminde Kısa Süreli Dönemli Değişimler., XV. Ulusal Astronomi Kongresi, 28 Ağustos - 1 Eylül 2006, İstanbul Kültür Üniversitesi (poster)
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• Ataç, T., Özgüç, Pektaş.R. "Investigation of the Solar Cycle Variation of foF2 by Using Solar Flare Index and MgII Core-to-Wing Index For the Cycles 22 and 23", International Symposium on Recent Observations of the Sun-Earth System (ISROSES) September 17-22, 2006 Bulgaria (poster)
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• Ataç T., Özgüç A., Pektaş R. "The Variability of foF2 In Different Phases of Solar Cycle 23", The Fourth UN/ESA/NASA/JAXA Workshop on the International Heliophysical Year 2007 and Basic Space Science, "First Results from the International Heliophysical Year 2007", 02-06 June 2008, Sozopol / Bulgaria
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• Ataç T., Özgüç A., Pektaş R. "The Variability of foF2 in Different Phases of Solar Cycle 23", Journal of Atmospheric and Solar-Terrestrial Physics, 71, 5, 583-588, 2009. SCIE - CPCI-S