Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..203h&link_type=abstract
In ESA, Seismology of the Sun and Sun-Like Stars p 203-208 (SEE N89-25819 19-92)
Physics
19
Doppler Effect, Helioseismology, Solar Observatories, Solar Oscillations, Breadboard Models, Data Processing, Data Reduction, Ground Stations, Solar Spectra, Space Observations (From Earth)
Scientific paper
An instrument is being developed to provide high-quality Doppler oscillation measurements for the Global Oscillation Network Group (GONG) project. This instrument uses the Fourier tachometer principle of sweeping a squared-cosine transmission function across a limited region of the solar spectrum centered on the Ni I line at 676.8 nm. Doppler shift is detected as a phase shift between the modulated solar signal and a simultaneously modulated signal from a stabilized laser. The solar signal is measured with an array of 250 by 250 pixels covering the full disk. Design goals include a short-term noise level at a single pixel of 10 m/sec per integration interval of 60s and a long-term stability of better than 1 m/s. A breadboard model is in operation since early 1988 and a prototype is under construction. Most of the observations as of August 1988 are of the Doppler shift of the entire Sun imaged onto a single detector. These observations easily show the global p-mode oscillations with good short-term signal-to-noise ratio but reveal interesting problems. Imaging measurements started with promising results.
Abdel-Gawad K.
Ball Warren
Boxum B.
Bull F.
Cole Joseph
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