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

    232941_232941.pdf (2.353Mb)
    Access Status
    Open access
    Authors
    Arora, 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.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Arora, B. and Morgan, J. and Ord, S. and Tingay, S. and Hurley-Walker, N. and Bell, M. and Bernardi, G. et al. 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 (Article No. e029): pp. 1-21.
    Source Title
    Publications of the Astronomical Society of Australia
    DOI
    10.1017/pasa.2015.29
    ISSN
    1323-3580
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    This version of the article has been accepted for publication and will appear in a revised form subsequent to peer review and/or editorial input. © Cambridge University Press.

    URI
    http://hdl.handle.net/20.500.11937/11608
    Collection
    • Curtin Research Publications
    Abstract

    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 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.

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