Short-Term Periodicities in Sunspot Activity and Flare Index Data during Solar Cycle 23

Kilic H.

SOLAR PHYSICS, cilt.255, sa.1, ss.155-162, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 255 Sayı: 1
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1007/s11207-008-9310-9
  • Dergi Adı: SOLAR PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.155-162
  • Anahtar Kelimeler: Flares, Short periodicities, Sunspot activity, TIME-SERIES, SOLAR-CYCLE-23, EVOLUTION, PHASE, WIND
  • Akdeniz Üniversitesi Adresli: Hayır

Özet

The short-term periodicities in sunspot numbers, sunspot areas, and flare index data are investigated in detail using the Date Compensated Discrete Fourier Transform (DCDFT) for the full disk of the Sun separately over the rising, the maximum, and the declining portions of solar cycle 23 (1996 -aEuro parts per thousand 2006). While sunspot numbers and areas show several significant periodicities in a wide range between 23.1 and 36.4 days, the flare index data do not exhibit any significant periodicity. The earlier conclusion of Pap, Tobiska, and Bouwer (1990, Solar Phys. 129, 165) and Kane (2003, J. Atmos. Solar-Terr. Phys. 65, 1169), that the 27-day periodicity is more pronounced in the declining portion of a solar cycle than in the rising and maximum ones, seems to be true for sunspot numbers and sunspot area data analyzed here during solar cycle 23.