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Variation of High-Degree Mode Frequencies During the Declining Phase of Solar Cycle 23
|National Solar Observatory|
|Auteur(s) supplémentaire(s)||K. Jain and F. Hill|
|It is well known that the acoustic frequencies of the Sun vary with the solar cycle and in general, can be used as a tracer of magnetic activity. However, recent studies using intermediate-degree global mode frequencies, both from GONG and MDI,|
have shown complex relationship during different phases of the solar cycle. In addition, global frequencies during the extended minimum phase have indicated anti-correlation with the measurements of solar activity indices. In this context, we investigate the temporal variation of the high-degree mode frequencies during the declining phase of the solar cycle 23 and the extended minimum
phase between the cycles 23 and 24. The frequencies are calculated from the GONG+ Dopplergrams using the ring-diagram technique.