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11th of November 2015
ATNF Colloquium
The importance of the Earth's atmosphere propagation medium effects on radio astronomical observations
by Maria Rioja (UWA/CASS)
Abstract.The Earth's atmosphere leaves its fingerprints on the incoming radiation waves which are observed from ground telescopes. These propagation effects are manifested in very distinct fashion depending on the observing frequency. They affect the outcomes of the observations and ultimately will limit the accuracy of the measurements. The development of new methods is therefore essential to achieve the full potential of the next generation of instruments coming into operation for the exploration of new regimes of the electromagnetic spectrum. In this talk I will present a variety of methods to mitigate the effects of the atmosphere in radio astronomical observations. Furthermore I will address the applicability to various fields of science. The first part will focus on the high frequency observations and tropospheric corrections, which has enabled for the first time high precision astrometry at 2mm and hours-long coherence times; the second part of the talk will address ionospheric propagation effects: what can be done and how to explore these ideas.

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