Response of a spaceborne gravitational wave antenna to solar oscillations
- 2 April 2009
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 79 (8), 082001
- https://doi.org/10.1103/physrevd.79.082001
Abstract
We investigate the possibility of observing very small amplitude low frequency solar oscillations with the proposed laser interferometer space antenna (LISA). For frequencies below the dominant contribution is from the near zone time-dependent gravitational quadrupole moments associated with the normal modes of oscillation. For frequencies above the dominant contribution is from gravitational radiation generated by the quadrupole oscillations which is larger than the Newtonian signal by a factor of the order , where is the distance to the Sun, and is the velocity of light. The low order solar quadrupole pressure and gravity oscillation modes have not yet been detected above the solar background by helioseismic velocity and intensity measurements. We show that for frequencies , the signal due to solar oscillations will have a higher signal to noise ratio in a LISA type space interferometer than in helioseismology measurements. Our estimates of the amplitudes needed to give a detectable signal on a LISA type space laser interferometer imply surface velocity amplitudes on the sun of the order of in the frequency range . If such modes exist with frequencies and amplitudes in this range they could be detected with a LISA type laser interferometer.
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