The Fourier tachometer 2: an instrument for measuring global solar velocity fields

Details The Fourier tachometer 2: an instrument for measuring global solar velocity fields The Fourier tachometer 2: an instrument for measuring global solar velocity fields

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984sses.nasa..157b&link_type=abstract

In JPL Solar Seismology from Space. p 157-163 (SEE N85-25060 14-92)

Computer Science

Performance

6

Solar Oscillations, Solar Spectra, Tachometers, Velocity Measurement, Doppler Effect, Field Of View, Noise Spectra, Signal Distortion

Scientific paper

The High Altitude Observatory and Sacramento Peak Observatory have jointly constructed a second version of the Fourier Tachometer, which is now undergoing final integration and testing. This is an interferometric instrument for measuring the Doppler shift of solar spectrum lines. The principal features and performance goals of this instrument are: simultaneous velocity observations over a 2-dimensional, 100 x 100 pixel field of view; measurement of absolute Doppler shifts with 1 m/s accuracy; noise level for moderate-1 oscillation modes of 1 cm/s for a 1-day observing run; flexibility and ease of use. Early (though incomplete) testing suggests that these goals should be attainable with the current instrument.

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