The solar oscillations imager for SOHO

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Satellite Imagery, Satellite-Borne Instruments, Soho Mission, Solar Instruments, Solar Oscillations, Data Systems, Imaging Techniques, Solar Observatories, Velocity Measurement

Scientific paper

The Solar Oscillations Imager (SOI) program for SOHO will consist of a Michelson Doppler Imager (MDI) instrument, a data reduction and analysis capability, and a coordinated set of investigations. The overall investigation is organized to address a set of science objectives. Primary objectives can be investigated using the techniques of helioseismology; associated objectives can be addressed by other analysis techniques. The MDI is designed to take advantage of the anticipated SOHO telemetry by organizing the observations into 4 observing programs: structure (at all times); dynamics (2 months per year); campaign (8 hr per day, 10 months per year), and magnetic fields (few minutes per day). The MDI will be able to measure line-of-sight velocity by Doppler shift, transverse velocity by local correlation tracking, line and continuum intensity, and line-of-sight magnetic fields with both 4 and 1.4 arc-second resolution (2 and 0.7 arc-sec pixels respectively). The data reduction, data management, and preliminary data analysis will be accomplished partly at Stanford and partly at the National Solar Observatory as an extension of the GONG project.

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