caa a22 4500 445346086 CHVBK 20180317142829.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s11207-011-9738-1 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9738-1 Periodicities of Sunspot Number and Coronal Index Time Series During Solar Cycle 23 [Elektronische Daten] [Partha Chowdhury, B. Dwivedi] We investigate the presence and temporal evolution of short- and intermediate-term periodicities in the daily data of sunspot numbers and coronal index for the time span from May 1996 to December 2008, which covers the entire Solar Cycle 23. The daily sunspot number data have been analyzed for the full disk, and for northern and southern hemispheres of the Sun. Using the wavelet power spectrum technique, we find a number of quasi-periodic oscillations in all the data sets. We also find a prominent period of 22 to 35 days in the high-frequency range, and detect the Rieger period of 150 to 160 days in both data sets during different phases of Cycle 23. We also detect ∼1.3 year oscillation in both sunspot and coronal index time series. In addition, we find a number of other short and mid-term periods. We discuss possible explanations of the observed periodicities in the light of previous results and existing numerical models. Springer Science+Business Media B.V., 2011 Sun: oscillations nationallicence Magnetic fields nationallicence Sunspot number nationallicence Corona nationallicence Rossby waves nationallicence Chowdhury Partha Department of Physics, University of Calcutta, 700 009, Kolkata, India aut Dwivedi B. Department of Applied Physics, Institute of Technology, Banaras Hindu University, 221 005, Varanasi, India aut Solar Physics Springer Netherlands 270/1(2011-05-01), 365-383 0038-0938 270:1<365 2011 270 11207 https://doi.org/10.1007/s11207-011-9738-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9738-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chowdhury Partha Department of Physics, University of Calcutta, 700 009, Kolkata, India aut NATIONALLICENCE 700 1- Dwivedi B. Department of Applied Physics, Institute of Technology, Banaras Hindu University, 221 005, Varanasi, India aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 270/1(2011-05-01), 365-383 0038-0938 270:1<365 2011 270 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer