Characterization of the Ionosphere Over the Murchison Radio Observatory

Details Characterization of the Ionosphere Over the Murchison Radio Observatory Characterization of the Ionosphere Over the Murchison Radio Observatory

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa21a1867h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA21A-1867

Astronomy and Astrophysics

Astronomy

[2437] Ionosphere / Ionospheric Dynamics, [2487] Ionosphere / Wave Propagation, [2494] Ionosphere / Instruments And Techniques

Scientific paper

The Murchison Radio Observatory (MRO), home of radio astronomy in Australia, is located in mid-latitude Western Australia. Projects currently under development at the MRO include a low-frequency instrument, the Murchison Widefield Array (MWA). The MWA is an aperture synthesis, imaging array operating over the frequency range 80 to 300 MHz. Signals in this range are subject to distortions caused by the ionosphere. The effects of scintillation and Faraday rotation degrade image quality. Historical measurements and models have long shown that the mid-latitude ionosphere has very low scintillation activity. TEC measurements we have made of the ionosphere over the MRO using high-precision, dual-frequency, GPS systems support this belief. Fine grained measurements (of the order 0.01-0.03 TEC units) have permitted fine-scale ionospheric structure to be resolved. These findings are reported and discussed. We review plans to extend this work with the implementation of mobile solar-powered instrumentation that will permit deployment of various GPS configurations that will collect TEC data during the forthcoming period of expected higher solar activity.

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