Waves in the sky: Probing the ionosphere with the Murchison Widefield Array

Loi, S.; Murphy, T.; Cairns, I.; Trott, Cathryn; Bell, M.; Hurley-Walker, Natasha; Morgan, John; Lenc, E.; Offringa, A.; Menk, F.; Waters, C.; Feng, L.; Hancock, Paul; Kaplan, D.; Kudryavtseva, N.; Lonsdale, C.; Erickson, P.; Coster, A.; Ekers, R.; Bernardi, G.; Bowman, J.; Briggs, F.; Cappallo, R.; Deshpande, A.; Gaensler, B.; Greenhill, L.; Hazelton, B.; Johnston-Hollitt, M.; McWhirter, S.; Mitchell, D.; Morales, M.; Morgan, E.; Oberoi, D.; Ord, S.; Prabu, T.; Shankar, N.; Srivani, K.; Subrahmanyan, R.; Tingay, Steven; Wayth, Randall; Webster, R.; Williams, Andrew; Williams, C.

doi:10.1109/URSI-AT-RASC.2015.7303197

Access Status

Fulltext not available

Authors

Loi, S.

Murphy, T.

Cairns, I.

Trott, Cathryn

Bell, M.

Hurley-Walker, Natasha

Morgan, John

Lenc, E.

Offringa, A.

Menk, F.

Waters, C.

Feng, L.

Hancock, Paul

Kaplan, D.

Kudryavtseva, N.

Lonsdale, C.

Erickson, P.

Coster, A.

Ekers, R.

Bernardi, G.

Bowman, J.

Briggs, F.

Cappallo, R.

Deshpande, A.

Gaensler, B.

Greenhill, L.

Hazelton, B.

Johnston-Hollitt, M.

McWhirter, S.

Mitchell, D.

Morales, M.

Morgan, E.

Oberoi, D.

Ord, S.

Prabu, T.

Shankar, N.

Srivani, K.

Subrahmanyan, R.

Tingay, Steven

Wayth, Randall

Webster, R.

Williams, Andrew

Williams, C.

Date

2015

Type

Conference Paper

Metadata

Show full item record

Citation

Loi, S. and Murphy, T. and Cairns, I. and Trott, C. and Bell, M. and Hurley-Walker, N. and Morgan, J. et al. 2015. Waves in the sky: Probing the ionosphere with the Murchison Widefield Array, in 1st URSI Atlantic Radio Science Conference (URSI AT-RASC), Las Palmas, 16-24 May 2015, pp. 1-2.

Source Title

2015 1st URSI Atlantic Radio Science Conference, URSI AT-RASC 2015

DOI

10.1109/URSI-AT-RASC.2015.7303197

ISBN

9789090086286

School

Curtin Institute of Radio Astronomy (Physics)

URI

http://hdl.handle.net/20.500.11937/17639

Collection

Curtin Research Publications

Abstract

© 2015 International Union of Radio Science (URSI). Low-frequency, wide-field radio telescopes such as the Murchison Widefield Array (MWA) enable the dense spatial sampling of the ionosphere and plasmasphere on regional scales. For a physically compact array such as the MWA, the refractive shifts in the positions of celestial sources in the synthesised radio images are proportional to spatial gradients in the total electron content (TEC) transverse to the line of sight. By measuring the angular position shifts of celestial radio sources, one can probe waves and disturbances in the intervening plasma. Radio telescopes differ fundamentally from other techniques for measuring plasma fluctuations in that they are sensitive to TEC gradients/differences rather than absolute TEC. This makes them sensitive specifically to fluctuations about the ambient density, and therefore powerful probes of plasma density waves and irregularities.