Ionospheric Modelling using GPS to Calibrate the MWA. II: Regional Ionospheric Modelling using GPS and GLONASS to Estimate Ionospheric Gradients
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We estimate spatial gradients in the ionosphere using the Global Positioning System and GLONASS (Russian global navigation system) observations, utilising data from multiple Global Positioning System stations in the vicinity of Murchison Radio-astronomy Observatory. In previous work, the ionosphere was characterised using a single-station to model the ionosphere as a single layer of fixed height and this was compared with ionospheric data derived from radio astronomy observations obtained from the Murchison Widefield Array. Having made improvements to our data quality (via cycle slip detection and repair) and incorporating data from the GLONASS system, we now present a multi-station approach. These two developments significantly improve our modelling of the ionosphere. We also explore the effects of a variable-height model. We conclude that modelling the small-scale features in the ionosphere that have been observed with the MWA will require a much denser network of Global Navigation Satellite System stations than is currently available at the Murchison Radio-astronomy Observatory.
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Ionospheric Modelling using GPS to Calibrate the MWA. I: Comparison of First Order Ionospheric Effects between GPS Models and MWA ObservationsArora, B.; Morgan, John; Ord, S.; Tingay, Steven; Hurley-Walker, Natasha; Bell, M.; Bernardi, G.; Bhat, Ramesh; Briggs, F.; Callingham, J.; Deshpande, A.; Dwarakanath, K.; Ewall-Wice, A.; Feng, L.; For, B.; Hancock, Paul; Hazelton, B.; Hindson, L.; Jacobs, D.; Johnston-Hollitt, M.; Kapinska, A.; Kudryavtseva, N.; Lenc, E.; McKinley, B.; Mitchell, D.; Oberoi, D.; Offringa, A.; Pindor, B.; Procopio, P.; Riding, J.; Staveley-Smith, L.; Wayth, Randall; Wu, C.; Zheng, Q.; Bowman, J.; Cappallo, R.; Corey, B.; Emrich, David; Goeke, R.; Greenhill, L.; Kaplan, D.; Kasper, J.; Kratzenberg, E.; Lonsdale, C.; Lynch, Mervyn; McWhirter, S.; Morales, M.; Morgan, E.; Prabu, T.; Rogers, A.; Roshi, A.; Shankar, N.; Srivani, K.; Subrahmanyan, R.; Waterson, M.; Webster, R.; Whitney, A.; Williams, A.; Williams, A. (2015)Copyright © Astronomical Society of Australia 2015 We compare first-order (refractive) ionospheric effects seen by the MWA with the ionosphere as inferred from GPS data. The first-order ionosphere manifests itself as a ...
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