Simultaneous observations of pulsar intensity variations at Parkes and Ootacamund

Details Simultaneous observations of pulsar intensity variations at Parkes and Ootacamund Simultaneous observations of pulsar intensity variations at Parkes and Ootacamund

Apr 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974mnras.167...31s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 167, Apr. 1974, p. 31-47.

Astronomy and Astrophysics

Astronomy

26

Diffraction Patterns, Pulsars, Radio Emission, Stellar Luminosity, Velocity Measurement, Amplitude Distribution Analysis, Astronomical Models, Cross Correlation, Data Reduction, Interstellar Extinction, Pulse Amplitude, Radio Reception

Scientific paper

Simultaneous observations at 326.5 MHz of the intensity variations of seven pulsars have been conducted over a 8000-km baseline between Australia and India. The theoretical interpretation of the drifting diffraction pattern is developed in some detail and a practical method is determined for measuring the velocity component along the baseline in the presence of intrinsic pulsar variability and random evolution of the pattern. It is shown that, because of the intrinsic variations, the usual method of determining velocity from the maximum cross-correlation leads to a large overestimate of the velocity. For the majority of the pulsars observed, the intensity fluctuations at the two stations were significantly decorrelated for all time shifts. It is concluded that the most likely reason for the decorrelation is the presence of a scale size approximately equal to our receiver separation of 8000 km.

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