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Aclarando un texto epistolar de Lope
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Effect of Purple Sweet Potato on Nuruk-making Process and Makgeolli Quality
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Analytical description of concentration dependence of surface tension in multicomponent systems
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An XPS Study of the Passive Film Formed on Pure Mo and MoSi~2 in 4M HCl
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상악 유전치의 치근단 병소로 인한 만곡 영구전치
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Bayes Classifier 기반 중요 객체 검출(SOD) 알고리즘
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- 저자 : Ozguc, A. (검색결과 2 건)
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Active Latitude Oscillations Observed on the Sun
Kilcik, A.,Yurchyshyn, V.,Clette, F.,Ozguc, A.,Rozelot, J.-P. Springer-Verlag 2016 Solar physics Vol.291 No.4
<P>We investigate periodicities in the mean heliographic latitudes of sunspot groups, called active latitudes, for the past six complete solar cycles (1945 - 2008). For this purpose, the multitaper method and Morlet wavelet analysis were used. We found that solar rotation periodicities (26 - 38 days) are present in active latitudes of both hemispheres for all the investigated cycles (18 to 23). Both in the northern and southern hemispheres, active latitudes drifted toward the equator from the beginning to the end of each cycle and followed an oscillating path. These motions are well described by a second-order polynomial. There are no meaningful periods of between 55 and about 300 days in either hemisphere for all cycles. A periodicity of 300 to 370 days appears in both hemispheres for Cycle 23, in the northern hemisphere for Cycle 20, and in the southern hemisphere for Cycle 18.</P>
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SOLAR CYCLE 24: CURIOUS CHANGES IN THE RELATIVE NUMBERS OF SUNSPOT GROUP TYPES
Kilcik, A.,Yurchyshyn, V. B.,Ozguc, A.,Rozelot, J. P. IOP Publishing 2014 ASTROPHYSICAL JOURNAL LETTERS - Vol.794 No.1
<P>Here, we analyze different sunspot group (SG) behaviors from the points of view of both the sunspot counts (SSCs) and the number of SGs, in four categories, for the time period of 1982 January-2014 May. These categories include data from simple (A and B), medium (C), large (D, E, and F), and decaying (H) SGs. We investigate temporal variations of all data sets used in this study and find the following results. (1) There is a very significant decrease in the large groups' SSCs and the number of SGs in solar cycle 24 (cycle 24) compared to cycles 21-23. (2) There is no strong variation in the decaying groups' data sets for the entire investigated time interval. (3) Medium group data show a gradual decrease for the last three cycles. (4) A significant decrease occurred in the small groups during solar cycle 23, while no strong changes show in the current cycle (cycle 24) compared to the previous ones. We confirm that the temporal behavior of all categories is quite different from cycle to cycle and it is especially flagrant in solar cycle 24. Thus, we argue that the reduced absolute number of the large SGs is largely, if not solely, responsible for the weak cycle 24. These results might be important for long-term space weather predictions to understand the rate of formation of different groups of sunspots during a solar cycle and the possible consequences for the long-term geomagnetic activity.</P>
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