| North-south asymmetry in the solar flare index T Ataç, A Özgüç Solar Physics 166, 201-208, 1996 | 124 | 1996 |
| Temporal variability of the flare index (1966–2001) A Özgüç, T Ataç, J Rybák Solar Physics 214, 375-396, 2003 | 95 | 2003 |
| Flare index of solar cycle 22 T Ataç, A Özgüç Solar Physics 180, 397-407, 1998 | 95 | 1998 |
| Periodic behavior of solar flare index during solar cycles 20 and 21 A Özgüç, T Atac Solar Physics 123, 357-365, 1989 | 84 | 1989 |
| Time distributions of large and small sunspot groups over four solar cycles A Kilcik, VB Yurchyshyn, V Abramenko, PR Goode, A Ozguc, JP Rozelot, ... The Astrophysical Journal 731 (1), 30, 2011 | 82 | 2011 |
| Nonlinear prediction of solar cycle 24 A Kilcik, CNK Anderson, JP Rozelot, H Ye, G Sugihara, A Ozguc The Astrophysical Journal 693 (2), 1173, 2009 | 76 | 2009 |
| Flare index during the rising phase of solar cycle 23 T Ataç, A Özgüç Solar Physics 198, 399-407, 2001 | 67 | 2001 |
| Periodicities in solar flare index for cycles 21–23 revisited A Kilcik, A Özgüç, JP Rozelot, T Ataç Solar Physics 264, 255-268, 2010 | 62 | 2010 |
| Prediction of solar cycle 25: a non-linear approach V Sarp, A Kilcik, V Yurchyshyn, JP Rozelot, A Ozguc Monthly Notices of the Royal Astronomical Society 481 (3), 2981-2985, 2018 | 60 | 2018 |
| Overview of the solar activity during solar cycle 23 T Ataç, A Özgüç Solar Physics 233, 139-153, 2006 | 56 | 2006 |
| The 73-day periodicity of the flare index during the current solar cycle 22 A Özgüç, T Ataç Solar physics 150, 339-346, 1994 | 50 | 1994 |
| Maximum coronal mass ejection speed as an indicator of solar and geomagnetic activities A Kilcik, VB Yurchyshyn, V Abramenko, PR Goode, N Gopalswamy, ... The Astrophysical Journal 727 (1), 44, 2010 | 43 | 2010 |
| Sunspot count periodicities in different Zurich sunspot group classes since 1986 A Kilcik, A Ozguc, V Yurchyshyn, JP Rozelot Solar Physics 289, 4365-4376, 2014 | 41 | 2014 |
| The variability of foF2 in different phases of solar cycle 23 T Ataç, A Özgüç, R Pektaş Journal of Atmospheric and Solar-Terrestrial Physics 71 (5), 583-588, 2009 | 38 | 2009 |
| Examination of the solar cycle variation of foF2 for cycles 22 and 23 A Özgüç, T Ataç, R Pektaş Journal of Atmospheric and Solar-Terrestrial Physics 70 (2-4), 268-276, 2008 | 35 | 2008 |
| Flare Production Potential Associated with Different Sunspot Groups S Eren, A Kilcik, T Atay, R Miteva, V Yurchyshyn, JP Rozelot, A Ozguc Monthly Notices of the Royal Astronomical Society, stw2742, 2016 | 34 | 2016 |
| Evaluation of the short-term periodicities in the flare index between the years 1966–2002 A Özgüç, T Ataç, J Rybák Solar Physics 223, 287-304, 2004 | 33 | 2004 |
| Solar cycle 24: Curious changes in the relative numbers of sunspot group types A Kilcik, VB Yurchyshyn, A Ozguc, JP Rozelot The Astrophysical Journal Letters 794 (1), L2, 2014 | 32 | 2014 |
| Effects of hysteresis in solar cycle variations between flare index and cosmic rays A Özgüç, T Atac New Astronomy 8 (8), 745-750, 2003 | 29 | 2003 |
| Flare index variability in the ascending branch of solar cycle 23 A Özgüç, T Ataç, J Rybák Journal of Geophysical Research: Space Physics 107 (A7), SSH 11-1-SSH 11-8, 2002 | 29 | 2002 |
