Measurements of Frequencies of Solar Oscillations from the
MDI medium-l Program
by E.J. Rhodes, Jr., A.G. Kosovichev, P.H. Scherrer, J. Schou & J. Reiter
Fig. 1a: Mode frequencies.
The multiplet frequencies determined from the MDI 144-day observing run
using the averaged-spectrum method are shown as the small blue dots.
Ridge-fit frequencies determined with the averaged-spectrum method as
applied to entire p-mode ridges rather than individual modal peaks are
shown as the red dots along the extensions of the ridges toward higher
degrees and frequencies.
The formal frequency uncertainties obtained from the averaged-spectrum
method are superimposed upon both the modal and ridge-fit frequencies in
yellow. For frequencies below 5 mHz the frequency uncertainties of the
modal fits were multiplied by a factor of 1000 before being plotted. For
frequencies greater than 5 mHz the uncertainties of the ridge fits were
multiplied by 100 instead. The uncertainties of the ridge fits below
5 mHz were not modified.
This figure may be compared with the m-averaged spectrum shown in Fig.1b.