An estimation of global solar p-mode frequencies from IRIS network data: 1989-1996

The IRIS network has accumulated full disk helioseismological data since Ju ly 1989, i.e. a complete 11-year solar cycle. Since the last paper publishi ng a frequency list [A&A 317 (1997) L71], not only has the network acquired new data, but has also developed new co-operative programs with compatible instruments [Abstr. SOHO 6/GONG 98 Workshop (1998) 51], so that merging IR IS files with these co-operative program data sets has made possible the im provement of the overall duty cycle. This paper presents new estimations of low degree p-mode frequencies obtained from this IRIS++ data bank covering the period 1989-1996, as well as the variation of their main parameters al ong the total range of magnetic activity, from before the last maximum to t he very minimum. A preliminary estimation of the peak profile asymmetries i s also included. (C) 2001 Published by Elsevier Science B.V.