Radio interferometric imaging of spatial structure that varies with time and frequency

Urvashi Rau

doi:10.1117/12.930207

15 October 2012 Radio interferometric imaging of spatial structure that varies with time and frequency

Urvashi Rau

Proceedings Volume 8500, Image Reconstruction from Incomplete Data VII; 85000N (2012) https://doi.org/10.1117/12.930207
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

The spatial-frequency coverage of a radio interferometer is increased by combining samples acquired at different times and observing frequencies. However, astrophysical sources often contain complicated spatial structure that varies within the time-range of an observation, or the bandwidth of the receiver being used, or both. Image reconstruction algorithms can been designed to model time and frequency variability in addition to the average intensity distribution, and provide an improvement over traditional methods that ignore all variability. This paper describes an algorithm designed for such structures, and evaluates it in the context of reconstructing three-dimensional time-varying structures in the solar corona from radio interferometric measurements between 5 GHz and 15 GHz using existing telescopes such as the EVLA and at angular resolutions better than that allowed by traditional multi-frequency analysis algorithms.

Citation Download Citation

Urvashi Rau "Radio interferometric imaging of spatial structure that varies with time and frequency", Proc. SPIE 8500, Image Reconstruction from Incomplete Data VII, 85000N (15 October 2012); https://doi.org/10.1117/12.930207

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