Physics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8815751h&link_type=abstract
Presented at the International Symposium on Experimental Gravitational Physics, Guangzhou, China, 3 Aug. 1987
Physics
Gravitational Fields, Helioseismology, Perturbation, Solar Oscillations, Sun, Detection, Gravity Waves, Solar Activity, Solar Gravitation
Scientific paper
Considerable evidence has been presented for the detection of low-degree internal gravity modes of the Sun. By combining the observations obtained at the Crimean Astrophysical Observatory and at SCLERA, a number of the modes have been classified with respect to their spatial properties. The number of such classifications has been extended in a subsequent gravity-mode project by Gu and Hill. These mode classifications have been tested using three additional sets of independent observations. Positive results have been obtained. These low-degree modes lead to oscillatory perturbations of the Sun's gravitational field. The amplitudes of these perturbations at the Earth are inferred from the observed temperature eigenfunctions. For the l = 2 modes with frequencies near 100 microHerz, it is projected that these perturbations in the gravitational field will produce strains of the order of 1.0E-18 in gravitational radiation detectors based on free masses. The signals are expected to have coherence times of hundreds or more years. The detection of these signals by gravitational radiation detectors would make available a new technique for use in solar seismological studies which could be quite useful. The detection of these signals could also serve as a way of monitoring the performance of a given set of gravitational radiation detectors.
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