Interpretation of pulsar long-term intensity variations

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Pulsars, Radio Emission, Stellar Radiation, Variable Stars, Interstellar Matter, Radiant Flux Density, Scintillation, Secular Variations, Stellar Models

Scientific paper

Pulsar long-term intensity variations can be understood as scintillation patterns produced by a thin phase screen located near to the observer. If one assumes a screen velocity of the order of the earth's velocity, and a typical scale size of the inhomogeneities in the interstellar medium of about 1013 cm, pulsar long-term intensity variations as well as low-frequency variations of extragalactic sources may be explained by the same screen. Observational tests for the validity of the model are proposed.

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