Ionospheric Modelling using GPS to Calibrate the MWA. I: Comparison of First Order Ionospheric Effects between GPS Models and MWA Observations

B.S. Arora, J. Morgan, S.M. Ord, S.J. Tingay, N. Hurley-Walker, M. Bell, G. Bernardi, N.D.R. Bhat, F. Briggs, J.R. Callingham, A.A. Deshpande, K.S. Dwarakanath, A. Ewall-Wice, L. Feng, Bi-Qing For, P. Hancock, B.J. Hazelton, L. Hindson, D. Jacobs, M. Johnston-HollittAnna Kapińska, N. Kudryavtseva, E. Lenc, B. Mckinley, D. Mitchell, D. Oberoi, A.R. Offringa, B. Pindor, P. Procopio, J. Riding, Lister Staveley-Smith, R.B. Wayth, Chen Wu, Q. Zheng, J.D. Bowman, R.J. Cappallo, B.E. Corey, D. Emrich, R. Goeke, L.J. Greenhill, D.L. Kaplan, J.C. Kasper, E. Kratzenberg, C.J. Lonsdale, M.J. Lynch, S.R. Mcwhirter, M.F. Morales, E. Morgan, T. Prabu, A.E.E. Rogers, A. Roshi, N.U. Shankar, K.S. Srivani, R. Subrahmanyan, M. Waterson, R.L. Webster, A.R. Whitney, A. Williams, A.C.L. Williams

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

© 2015 Astronomical Society of Australia. 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 bulk position shift of the observed sources across an MWA field of view. These effects can be computed from global ionosphere maps provided by GPS analysis centres, namely the CODE. However, for precision radio astronomy applications, data from local GPS networks needs to be incorporated into ionospheric modelling. For GPS observations, the ionospheric parameters are biased by GPS receiver instrument delays, among other effects, also known as receiver DCBs. The receiver DCBs need to be estimated for any non-CODE GPS station used for ionosphere modelling. In this work, single GPS station-based ionospheric modelling is performed at a time resolution of 10 min. Also the receiver DCBs are estimated for selected Geoscience Australia GPS receivers, located at Murchison Radio Observatory, Yarragadee, Mount Magnet and Wiluna. The ionospheric gradients estimated from GPS are compared with that inferred from MWA. The ionospheric gradients at all the GPS stations show a correlation with the gradients observed with the MWA. The ionosphere estimates obtained using GPS measurements show promise in terms of providing calibration information for the MWA.
Original languageEnglish
Article numbere029
Pages (from-to)1-21
JournalPublications of the Astronomical Society of Australia
Volume32
DOIs
Publication statusPublished - 10 Aug 2015

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  • Projects

    MIRA Widefield Array - A New Low Frequency Telescope

    Staveley-Smith, L., Webster, R., Briggs, F., Dickey, J., Lynch, M., Green, A., Bailes, M., Lonsdale, C., Boyle, B., Greenhill, L. & Sault, R.

    Australian Research Council

    1/01/0831/12/09

    Project: Research

    Cite this

    Arora, B. S., Morgan, J., Ord, S. M., Tingay, S. J., Hurley-Walker, N., Bell, M., Bernardi, G., Bhat, N. D. R., Briggs, F., Callingham, J. R., Deshpande, A. A., Dwarakanath, K. S., Ewall-Wice, A., Feng, L., For, B-Q., Hancock, P., Hazelton, B. J., Hindson, L., Jacobs, D., ... Williams, A. C. L. (2015). Ionospheric Modelling using GPS to Calibrate the MWA. I: Comparison of First Order Ionospheric Effects between GPS Models and MWA Observations. Publications of the Astronomical Society of Australia, 32, 1-21. [e029]. https://doi.org/10.1017/pasa.2015.29