Interplanetary phase scintillation and the search for very low frequency gravitational radiation

Details Interplanetary phase scintillation and the search for very low frequency gravitational radiation Interplanetary phase scintillation and the search for very low frequency gravitational radiation

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230..570a&link_type=abstract

Astrophysical Journal, Part 1, vol. 230, June 1, 1979, p. 570-574.

Astronomy and Astrophysics

Astronomy

39

Gravitational Waves, Interplanetary Medium, Scintillation, Spaceborne Astronomy, Frequency Stability, Power Spectra, Spacecraft Tracking, Troposphere, Viking Spacecraft

Scientific paper

Observations of radio-wave phase scintillation are reported which used the Viking spacecraft having an earth-spacecraft link very similar to that which will be used in very low-frequency (VLF) gravitational-wave searches. The phase power-spectrum level varies by seven orders of magnitude as the sun-earth-spacecraft (elongation) angle changes from 1 to 175 deg. It is noteworthy that a broad minimum in the S-band (2.3 GHz) phase fluctuation occurs in the antisolar direction; the corresponding fractional frequency stability (square root Allan variance) is about 3 x 10 to the -14th for 1000-s integration times. A simultaneous two-frequency two-station observation indicates that the contribution to the phase fluctuation from the ionosphere is significant but dominated by the contribution from the interplanetary medium. Nondispersive tropospheric scintillation was not detected (upper limit to fractional frequency stability about 5 x 10 to the -14th). Evidently, even observations in the antisolar direction will require higher radio frequencies, phase scintillation calibration, and correlation techniques in the data processing, for detection of gravitational bursts at the anticipated strain amplitude levels of no more than 10 to the -15th.

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