Evolution of Sunspot Characteristics in Cycle 23

Gómez, A.; Curto, J. J.; Gras, C.
January 2014
Solar Physics;Jan2014, Vol. 289 Issue 1, p91
Academic Journal
The aim of this work is to present a statistical study of several parameters (variables) that define sunspot groups. These variables include maximum area, growth and decay times, as well as the evolution families, and solar-cycle phase the groups belong to. We classified group types based on the Zurich classification, which allows us to define a set of families based on their evolution patterns. The time variation of the area of a group was also studied, and a relationship between the maximum area and the growth and decay times was sought. Another study was carried out to find the correlation among different characteristics of the groups, as well as how the probability of a certain value of decay time can vary depending on morphological characteristics defined by these variables. Thus, a program based on a weight matrix combining the variables necessary to classify a group, together with the calculation of the probability for a specific event, has been produced. This approach allows us to predict the future behavior of a group from its historical evolution.


Related Articles

  • Influence of the 11-Year Solar Cycle on Variations of Cosmic Ray Intensity. Ma, L. H.; Han, Y. B.; Yin, Z. Q. // Solar Physics;Mar2009, Vol. 255 Issue 1, p187 

    The monthly cosmic ray intensity (CRI) time series from Climax, Huancayo, Moscow, Kiel, and Calgary are used to investigate the presence of the 11-year periodic component with special attention paid to the solar influence on these variations. The results show obvious 11-year temporal...

  • Variation in sunspot properties between 1999 and 2014. Rezaei, R.; Beck, C.; Lagg, A.; Borrero, J. M.; Schmidt, W.; Collados, M. // Astronomy & Astrophysics / Astronomie et Astrophysique;Jun2015, Vol. 578, p1 

    Aims. We study the variation in the magnetic field strength, area, and continuum intensity of umbrae in solar cycles 23 and 24. Methods. We analyzed a sample of 374 sunspots observed from 1999 until 2014 with the Tenerife Infrared Polarimeter at the German Vacuum Tower Telescope and the Facility...

  • Ineffectiveness of Narrow CMEs for Cosmic Ray Modulation. Paouris, Evangelos // Solar Physics;Jun2013, Vol. 284 Issue 2, p589 

    Monthly coronal mass ejection (CME) counts, - for all CMEs and CMEs with widths > 30, - and monthly averaged speeds for the events in these two groups were compared with both the monthly averaged cosmic ray intensity and the monthly sunspot number. The monthly P-index, which is a linear...

  • High Flare Activity in the Late Declining Phase of Cycle 23. Bai, Taeil // Solar Physics;Apr2006, Vol. 234 Issue 2, p409 

    In the declining phase of the current solar cycle (23), a large number of major flares were produced. In this cycle, the monthly sunspot number continuously remained below 100 since October 2002. However, during four epochs since then, flare activity became very high. Compared to this, each of...

  • Study of the Cosmic Ray Diurnal Anisotropy During Different Solar and Magnetic Conditions. Singh, Munendra; Badruddin // Solar Physics;Feb2006, Vol. 233 Issue 2, p291 

    The pressure-corrected hourly counting rate data of four neutron monitor stations have been employed to study the variation of cosmic ray diurnal anisotropy for a period of about 50 years (1955–2003). These neutron monitors, at Oulu ( R c = 0.78 GV), Deep River ( R c = 1.07 GV), Climax (...

  • Prediction of basic elements of the forthcoming solar cycles 24 and 25 (years 2005–2027). Tritakis, Vasilis; Mavromichalaki, Helen; Giouvanellis, George // AIP Conference Proceedings;2006, Vol. 848 Issue 1, p154 

    Fundamental parameters of a solar cycle could be predicted if we take in mind an existed interdependence between successive 11-year and 22-year cycles. Elements which could be predicted are, the time of rise, the total duration and the yearly values of the activity on the maximum and minimum...

  • Long-Term Variations of Solar Differential Rotation and Sunspot Activity: Revisited. Li, K. J.; Feng, W.; Shi, X. J.; Xie, J. L.; Gao, P. X.; Liang, H. F. // Solar Physics;Mar2014, Vol. 289 Issue 3, p759 

    Long-term variations of solar differential rotation and sunspot activity are investigated through re-analyzing the data on parameters of the differential-rotation law obtained by Makarov, Tlatov, and Callebaut ( Solar Phys.170, 373, 1997 ), Javaraiah, Bertello, and Ulrich ( Astrophys. J.626,...

  • A New Method for Prediction of Peak Sunspot Number and Ascent Time of the Solar Cycle. Kakad, B. // Solar Physics;May2011, Vol. 270 Issue 1, p393 

    The purpose of the present study is to develop an empirical model based on precursors in the preceding solar cycle that can be used to forecast the peak sunspot number and ascent time of the next solar cycle. Statistical parameters are derived for each solar cycle using 'Monthly' and 'Monthly...

  • The Shape of Solar Cycle Described by a Modified Gaussian Function. Du, Zhanle // Solar Physics;Oct2011, Vol. 273 Issue 1, p231 

    The shape of each sunspot cycle is found to be well described by a modified Gaussian function with four parameters: peak size A, peak timing t, width B, and asymmetry α. The four-parameter function can be further reduced to a two-parameter function by assuming that B and α are quadratic...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics