Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..359f&link_type=abstract
In ESA, Seismology of the Sun and Sun-Like Stars p 359-362 (SEE N89-25819 19-92)
Astronomy and Astrophysics
Astronomy
25
Helioseismology, Solar Observatories, Spaceborne Astronomy, U.S.S.R. Space Program, Satellite-Borne Instruments, Solar Constant, Solar Spectrometers
Scientific paper
The IPHIR (InterPlanetary Helioseismology by IRradiance measurements) is a solar irradiance experiment on the USSR planetary mission PHOBOS to Mars and its satellite Phobos. The sensor is a three-channel sunphotometer (SPM) which measures the solar spectral irradiance at 335, 500, and 865 nm with a precision of better than 1 ppm. A two axis solar sensor is added to monitor the moderate solar pointing of the spacecraft. A microprocessor based data processing unit controls the sensor operation, acquires the data and performs the data compression for the transmission at a mean rate of 1 bit/s. The experiment on PHOBOS 1 gathered data during 45 days before the S/C was lost, the one on PHOBOS 2 is still operating. The data recovery is excellent with virtually 100 percent coverage. Although the signal is disturbed by the pointing of the spacecraft the results of a preliminary analysis in the range of 5 min oscillations show the improvement achievable.
Bonnet Roger-Maurice
Bruns A. V.
Delaboudinière Jean Pierre
Domingo Vicente
Froehlich Claus
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