Computer Science
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..407h&link_type=abstract
In ESA, Seismology of the Sun and Sun-Like Stars p 407-412 (SEE N89-25819 19-92)
Computer Science
Doppler Effect, Imaging Techniques, Michelson Interferometers, Satellite-Borne Instruments, Soho Mission, Solar Instruments, Solar Oscillations, Sun, Thematic Mapping, Velocity Measurement
Scientific paper
The Michelson Doppler Imager (MDI) will be the instrument used in the Solar Oscillations Imager Program on SOHO. The MDI will make a line-of-sight velocity map of the full solar disk with 2 arc-sec pixels each minute. The instrument will be a modification of the Fourier tachometer and will operate by using narrow bandpass solar images at 4 wavelengths to measure the line profile of the Ni I line at 6768 A. This method is relatively insensitive to line profile changes and has a linear response to velocity. The instrument is also capable of making partial maps with 0.7 arc-sec pixels. All data will be transmitted to the ground for 2 continuous months each year and 8 hr each day (160 kilobits/sec). At all times the on-board computer will compute and transmit a selection of modes (5 kilobits/sec) to fully exploit the advantages of a space based telescope. Line-of-sight magnetic fields will also be measured regularly.
Hoeksema Jon Todd
Scherrer Philip H.
Tarbell Ted D.
Title Alan M.
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