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Solar Physics

, Volume 261, Issue 1, pp 173–191 | Cite as

Short-Term Periodicities in Sunspot Activities During the Descending Phase of Solar Cycle 23

  • Partha Chowdhury
  • Manoranjan Khan
  • P. C. Ray
Article

Abstract

In the present study, the short-term periodicities in the daily data of the sunspot numbers and areas are investigated separately for the full disk, northern, and southern hemispheres during Solar Cycle 23 for a time interval from 1 January 2003 to 30 November 2007 corresponding to the descending and minimum phase of the cycle. The wavelet power spectrum technique exhibited a number of quasi-periodic oscillations in all the datasets. In the high frequency range, we find a prominent period of 22 – 35 days in both sunspot indicators. Other quasi-periods in the range of 40 – 60, 70 – 90, 110 – 130, 140 – 160, and 220 – 240 days are detected in the sunspot number time series in different hemispheres at different time intervals. In the sunspot area data, quasi-periods in the range of 50 – 80, 90 – 110, 115 – 130, 140 – 155, 160 – 190, and about 230 days were noted in different hemispheres within the time period of analysis. The present investigation shows that the well-known “Rieger periodicity” of 150 – 160 days reappears during the descending phase of Solar Cycle 23, but this is prominent mainly in the southern part of the Sun. Possible explanations of these observed periodicities are delivered on the basis of earlier results detected in photospheric magnetic field time series (Knaack, Stenflo, and Berdyugina in Astron. Astrophys. 438, 1067, 2005) and solar r-mode oscillations.

Sun: activities Sun: magnetic field Sun: sunspots 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Department of PhysicsUniversity of CalcuttaKolkataIndia
  2. 2.Department of Instrumentation Science & Centre for Plasma StudiesJadavpur UniversityCalcuttaIndia
  3. 3.Department of MathematicsGovt. College of Engineering and Leather TechnologyCalcuttaIndia

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