Solar P-mode frequencies from the IRIS network.

Details Solar P-mode frequencies from the IRIS network. Solar P-mode frequencies from the IRIS network.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..235g&link_type=abstract

Astronomy and Astrophysics, v.323, p.235-242

Astronomy and Astrophysics

Astrophysics

11

Sun: Oscillations, Activity

Scientific paper

The Iris network for helioseismology has operated since 1989. We present tables of solar p-mode frequencies for observations taken during the four summer seasons from 1989 to 1992. This analysis uses the technique of maximum likelihood fitting and a χ_2_^2^ model for the probability density function of the spectrum. The simultaneous fitting of odd and even pairs of peaks strengthens the identification of the l=3 eigenmodes and improves the error bars on the 0-2 group. The frequencies are in good agreement with other observational results and with theoretical values for the D_0_ and the {DELTA}ν parameters of the asymptotic approximation. A decrease of 0.25+/-0.12μHz is seen between the 1989 and the 1992 data sets. The change is associated with the decrease of solar activity and is comparable with results of previous studies.

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