p-mode frequencies variability in 15 years of IRIS++ data
Abstract
IRIS++ data (the low degree l >= 3 helioseismology network) have been analysed for the study of p-modes parameters over the solar cycle 22 and the rising phase of cycle 23. This paper discusses the variations of all p-modes parameters along these 11 years. We present the analysis of frequency dependance and time dependance of p-modes frequencies and linewidths. We focus our attention on frequency shifts and study their different behaviours between even and odd modes. We discuss also about periodicities less than 1 year which appear in the frequency measurements.
- Publication:
-
SF2A-2002: Semaine de l'Astrophysique Francaise
- Pub Date:
- June 2002
- Bibcode:
- 2002sf2a.conf..565S