Measurement of solar gravitational oblateness with gravity gradiometers

Details Measurement of solar gravitational oblateness with gravity gradiometers Measurement of solar gravitational oblateness with gravity gradiometers

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978clus.nasa...69f&link_type=abstract

In JPL A Close-up of the Sun p 69-78 (SEE N78-32964 23-92)

Computer Science

Magnetometers, Mission Planning, Solar Gravitation, Solar Oblateness, Solar Probes, Spacecraft Instruments, Resonant Frequencies, Rotating Bodies, Solar Magnetic Field, Spacecraft Motion

Scientific paper

A very high sensitivity rotating gravity gradiometer onboard the spacecraft is described for measuring the gravitational oblateness of the Sun during a solar probe mission. The proposed instrument would be a self-contained structure in a thermal-vacuum-magnetic shield in the shape of a cross, with a mass of 20 kg and arm length of 1.0 m and thickness of 0.1 m. The sensor inside would have a resonant frequency of 1/30 Hz, a mechanical Q of one million and would use gravitational radiation antenna technology to achieve a sensitivity of 6 x 10 to the minus 8th power Eotvos, which would provide a measurement of the solar oblateness to an accuracy of 1.5 to 6 x 10 to the minus 8th power. The gravity gradiometer will require a spinning spacecraft, so that it will not sense the spacecraft gravity fields, but the gradiometer does not need to be at the spacecraft center of mass, or even on the spacecraft spin axis. Major problem areas to be addressed are demonstration of the instrument sensitivity prior to flight and the measurement and compensation for any residual spacecraft angular rates.

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