Power spectra comparison between GOLF and MDI velocity observations

Details Power spectra comparison between GOLF and MDI velocity observations Power spectra comparison between GOLF and MDI velocity observations

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5617h&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #56.17; Bulletin of the American Astronomical Society, Vol. 31, p.914

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present a comparison of the velocity power spectra between the GOLF and MDI instruments. In addition, this poster outlines work towards creating a GOLF-simulated signal utilizing MDI velocity images. The simulation of the GOLF signal is achieved by integrating spatially weighted masks with MDI LOI-proxy velocity images. The GOLF-simulated signal and a selection of additional spatially masked MDI velocity signals are compared with the observed GOLF signal for a 759 day period from May 25, 1996 through June 22, 1998. Ultimately, a cross-analysis process between GOLF and MDI signals could lead to an enhancement of our ability to detect low frequency solar oscillations. The signal-to-background ratio (S/B) for the GOLF and the spatially masked MDI velocity data is presented for low degree (l <= 3) and low frequency p-modes. We find that signals from both MDI and GOLF are beneficial for detecting low degree (l <= 3) and low frequency (< 2000 mu Hz) p-modes. For the frequency range and the signals compared in this poster, the GOLF signal has the highest S/B for l=0 p-modes. The S/B of the GOLF and MDI central region masked signals is good for detecting l=1 p-modes. For l >= 2 p-modes, the central region masked signals have the highest S/B of the power spectra compared here. In addition, the S/B of the preliminary GOLF-simulated signal is found to be more similar to the GOLF signal than the MDI LOI-proxy signal without spatial masking for the modes investigated here.

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