Pioneer 10 search for gravitational wavesno evidence for coherent radiation from Geminga
Abstract
It has been reported^{1} that an observed 160min solar oscillation may be caused by gravitational radiation from the intense γray source Geminga, a source whose period according to the report is exactly one cycle per year different from the solar oscillation period. This remarkable coincidence has motivated us to look for a sinusoidal component having a period near 160min in Doppler data from the 1981 gravitational wave search with Pioneer 10. We find no such component in our most quiet data. Thus, the amplitude of a possible sinusoidal variation is no more than 3.3 × 10^{14} in fractional Doppler frequency, which for the direction of Geminga translates into an upper bound of 2 × 10^{14} for the polarization component of gravitational spatial strain potentially observable. This places rather stringent limits on the amount of gravitational radiation available to excite the 160min normal mode of the Sun.
 Publication:

Nature
 Pub Date:
 March 1984
 DOI:
 10.1038/308158a0
 Bibcode:
 1984Natur.308..158A
 Keywords:

 Gamma Rays;
 Gravitational Waves;
 Pioneer 10 Space Probe;
 Solar Oscillations;
 Fast Fourier Transformations;
 Least Squares Method;
 Power Spectra;
 Astrophysics