- PII
- S3034517025110066-1
- DOI
- 10.7868/S3034517025110066
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume 102 / Issue number 11
- Pages
- 1022-1035
- Abstract
- As part of the Early Science Program of the RadioAstron project, the millisecond pulsar B1937+21 was observed in October 2012. The total duration of the experiment supported by eight ground-based radio telescopes was about three hours. The radiation in both circular polarizations in the frequency band of 1644–1676 MHz was recorded. Characteristic time and frequency scales of scintillation caused by the scattering on the interstellar plasma density fluctuations were measured: Δ = 275.2 ± 0.1 s and Δ = 580 ± 30 kHz. The angular diameter of the scattering disk, θ = 0.32 ± 0.03 mas, have been estimated from the drop-off of the amplitude of the interferometric response at the ground-space baselines. The dependence of the visibility amplitude on the delay shows two scattering time scales: τ = 110 ± 30 ns and τ = 750 ± 100 ns, which indicates an ellipse-like scattering disc with an axis ratio of 2.6:1. The drift of the visibility maximum on the residual interference frequency that was observed at the intercontinental baselines can be explained by atmospheric effects, the dominant contribution being the additional phase shift in the troposphere above European stations.
- Keywords
- межзвездная плазма радиопульсары межзвездные мерцания РСДБ
- Date of publication
- 27.06.2025
- Year of publication
- 2025
- Number of purchasers
- 0
- Views
- 21
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