Characterisation of the Ionosphere over the Murchison Radio Observatory, Murchison, Western Australia

Details Characterisation of the Ionosphere over the Murchison Radio Observatory, Murchison, Western Australia Characterisation of the Ionosphere over the Murchison Radio Observatory, Murchison, Western Australia

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa23a1460h&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA23A-1460

Astronomy and Astrophysics

Astronomy

[2403] Ionosphere / Active Experiments, [2437] Ionosphere / Ionospheric Dynamics, [2483] Ionosphere / Wave/Particle Interactions, [2494] Ionosphere / Instruments And Techniques

Scientific paper

The Murchison Radio Observatory (MRO) is the future home of radio astronomy in Australia. Projects are currently under development at the MRO, including a low-frequency instrument, the Murchison Widefield Array (MWA). The MWA is an aperture synthesis, imaging array that when complete will comprise approximately 8,000 dipole antennas, operating in the frequency range, 80 to 300 MHz. Signals in the frequency range of interest reaching the MWA are subject to distortions caused by the ionosphere. The effects of scintillation and Faraday rotation degrade image quality. Self-calibration techniques compensate for scintillation and in the process, provide accurate relative total electron content (TEC) measures of the ionosphere (milli-TEC). However, to ‘unwind’ Faraday rotation effects, the absolute TEC (aTEC) of the ionosphere must be determined. This step is necessary in order to study processes in space involving magnetism. Over a period of two years, absolute TEC measurements have been made over the MRO using high-precision, dual-frequency GPS systems. Continuous measurements have been performed over the past year and campaign-based measurements prior to that. This paper presents results from those studies, which are providing insights into the nature of the ionosphere over a previously poorly understood, mid-latitude region of the southern hemisphere. This work too, is laying a foundation for the accurate characterisation of the ionosphere over the MRO which is also the possible future site of the Square Kilometre Array (SKA).

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